1. Gao, X., Xu, C., Asada, N. & Frenette, P. S. The hematopoietic stem cell niche: from embryo to adult. Development 145, dev139691 (2018). Article Google Scholar 2. Hoggatt, J., Kfoury, Y. & Scadden, D. T. Hematopoietic stem cell niche in health and disease. Annu. Rev. Pathol. 11, 555–581 (2016). CAS Article Google Scholar 3.
There was no clearer set of contrasts between how SpaceX and NASA approach launch vehicle development than the dueling tests the two performed in early December of Starship and Space Launch System, respectively. It was hard to miss the Dec. 9 test flight of SpaceX’s Starship SN8 prototype, the first time the vehicle flew more
The contraption Matt Sheffer wants to show me sits at the far end of a field of alfalfa and grasses, a weave of green and pale gold, broken only by the parallel grooves we’re trudging along, a path carved by the tires of a pickup truck. It’s Nov. 4, and America is in the midst
Alibaba Group signage is seen during the company’s 11.11 Singles’ Day global shopping festival at their headquarters in Hangzhou, Zhejiang province, China, November 11, 2020. Aly Song | Reuters BEIJING — Shares of Alibaba fell in both Hong Kong and extended-hours U.S. trading as reports surfaced that the Chinese government is conducting an anti-monopoly probe
Hear our reporters’ top podcast segments of 2020. Your browser does not support the audio element. Download MP3 In this episode: 00:32 Following the Viking footprint across Europe In September, we heard about the researchers mapping ancient genomes to better understand who the Vikings were, and where they went. Nature Podcast: 16 September 2020 Research
Up until now the Air Force had to transfer money from the the Air Force to the Space Force for each program line. WASHINGTON — The massive $2.3 trillion appropriations package Congress passed for fiscal year 2021 provides $696 billion for the Defense Department, including $15.2 billion for the U.S. Space Force. The bill passed
Let it snow: Brighten up your holiday season with some quizzing. (Courtesy: Shutterstock/ESB-Professional) 1. It’s dark at the North Pole in winter. Fortunately, Santa’s reindeer have exceptional eyesight. Which wavelengths of light can they see? A Ultraviolet B Infrared C Microwave D All of the above 2. In 2019, researchers at the University of Manchester calculated
A platypus whisperer from Tasmania surprises experts with his citizen science. The man has bonded with a platypus, an animal that is known to be very elusive. The man, Pete Walsh, comes from Hobart, the capital city of Australia’s island Tasmania state. Vonna Keller, his partner, named him “platypus whisperer” due to his special relationship with a platypus, whom they called Zoom.
replying to K. Soltesz et al. Naturehttps://doi.org/10.1038/s41586-020-3025-y (2020) The accompanying Comment1 concerns our original paper, Flaxman et al.2, in which we introduced a Bayesian hierarchical model to estimate the transmission intensity (in terms of the time-varying reproduction number, Rt) of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) from observed counts of coronavirus disease 2019 (COVID-19)-related deaths.
The Pentagon’s overseers in Congress have been consistently critical of how the military acquires space hardware. Frustration with space procurements was in fact one of the catalysts for the creation of the U.S. Space Force. Satisfying congressional demands for a revamped space acquisition process will now fall on President-elect Joe Biden’s Pentagon team. Earlier this
Date/Time: January 21, 2021 (1-2PM ET / 10-11AM PT) With a steady parade of corporate carbon net-zero pledges released in 2020 and even more coming in 2021, there is an enormous demand for forest carbon credits. This is empowering local and global actors to drive climate impact and opens the door for
WILMINGTON, DELAWARE – DECEMBER 11: U.S. President-elect Joe Biden speaks during an event to announce new cabinet nominations at the Queen Theatre on December 11, 2020 in Wilmington, Delaware. President-elect Joe Biden is continuing to round out his domestic team with the announcement of his choices for cabinet secretaries of Veterans Affairs and Agriculture, and
From left to right: Rong Tan, Yajing Shen and Xiong Yang from City University of Hong Kong are developing magnetically driven millirobots. (Courtesy: Xiong Yang) It is thrilling to live at a time when robots the size of small insects, known as millirobots, can open up new avenues of research. Such millirobots can be finely
A new population of blue whales was discovered by an international team of researchers in the western Indian Ocean. In a paper published in the Endangered Species Research journal, the researchers report that the newly reported blue whale song were recorded from Arabian Sea coast of Oman, crossing the Chagos Archipelago in the central Indian
By Lindsay Olson Scientific Adviser: Dr. Don Lincoln Curator: Georgia Schwender As Fermilab’s first artist in residence, my workspace had some unusual supplies for an artist’s studio. Pinned to my idea board I had a list of subatomic particles, quotes from popular physics books, the names of inspiring physicists, and a picture of Nobel Laureate
arising from S. Flaxman et al. Nature https://doi.org/10.1038/s41586-020-2405-7 (2020) Flaxman et al.1 took on the challenge of estimating the effectiveness of five categories of non-pharmaceutical intervention (NPI)—social distancing encouraged, self isolation, school closures, public events banned, and complete lockdown—on the spread of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). On the basis of mortality data
WASHINGTON — Voyager Space Holdings, a company that has acquired several space ventures, is taking a majority stake in commercial space station company Nanoracks, the two firms announced Dec. 23. Voyager announced it would take a majority stake in XO Markets, the parent company of Nanoracks. The companies did not disclose terms of the agreement.
Apple CEO Tim Cook (l) and Mark Zuckerberg, CEO and founder of Facebook. Getty Images (L) | Reuters (R) In October 2018, Apple CEO Tim Cook criticized the business practices of Big Tech rivals in an impassioned speech at a privacy conference in Brussels. “Every day, billions of dollars change hands, and countless decisions are
The Hayabusa2 capsule that landed in the desert in South Australia.Credit: AP/Shutterstock Asteroid dust recovered from Hayabusa2 Japan’s mission to bring asteroid dust back to Earth has succeeded. The Japan Aerospace Exploration Agency (JAXA) confirmed on 14 December that a capsule from the spacecraft Hayabusa2, which landed in an Australian desert last week, contained black
VALETTA, Malta — Through a novel approach to testing, the European Space Agency’s Clean Space initiative is assisting in the development of satellite components that are designed for demise, an approach to satellite development that advocates for the safe disposal of spacecraft by destructive atmospheric reentry. The ESA Clean Space initiative was launched in 2012
When you think of Colgate-Palmolive, the first thing likely to come to mind is its eponymous toothpaste or dish soap. But the company also owns a lot of other brands that offer other consumer packaged goods such as deodorant (Speed Stick), body soap (Irish Spring) and other household cleaning products (Fabuloso). And what are those
In this episode, Andrew Glester is joined by Physics World journalists to discuss some of 2020’s best physics books, along with their favourite examples of physics featuring in television and film this year. For more information about all of the media discussed, you can revisit these reviews that have appeared in Physics World during 2020.
The rainforest is teeming with life, and are precious ecosystems that harbor 80% of the world’s entire terrestrial biodiversity of animals, plants, and other organisms. This article features some of the most amazing rainforest animals that are currently being protected due to threats to their existence. The mountain gorilla These primates are the largest extant primates and are our closest animal relatives together with
When the coronavirus pandemic limited face-to-face interactions earlier this year, companies, governments and other organizations adapted to the new normal by transitioning many activities online. The transition, a part of the digital transformation that has played out over the years, was a boon for companies like cloud messaging provider Twilio, whose CEO Jeff Lawson told
Brad Garlinghouse, CEO of Ripple. John Chiala | CNBC The Securities and Exchange Commission filed charges Tuesday against Ripple, the fintech company best known for cryptocurrency XRP, and two of its executives, for allegedly violating investor protection laws. The SEC alleged that Ripple, co-founder Christian Larsen and CEO Bradley Garlinghouse, raised more than $1.3 billion through an
A new Chinese carrier rocket made its first flight on Tuesday under a long-term plan to develop reusable launch vehicles aimed at reducing mission costs and speed up launch schedules for commercial clients. The medium-lift Long March 8 Y-1 blasted off at 12:37pm (10:07am IST) from the southern Chinese island of Hainan carrying five satellites,
Climate comeback 2021 looks set to be a pivotal year for the fight against climate change. US president-elect Joe Biden has made clear that he will move to restore the country’s leadership in that regard, including by rejoining the Paris climate agreement to fight global warming. (President Donald Trump pulled the United States out of
Space Development Agency spokeswoman Jennifer Elzea said in a statement Dec. 22 that the agency is “expeditiously implementing its corrective action plan for the Tracking Tranche 0 solicitation.” WASHINGTON — Companies that competed earlier this year for Space Development Agency satellite contracts awarded to L3Harris and SpaceX were asked to resubmit their proposals following several
Patrick Pleul/picture alliance via Getty Images The coronavirus relief bill passed by Congress toughens rules around use of a common heat-trapping chemical and funnels billions of dollars into renewable energy. The measures, attached to a year-end government funding bill, were hailed by some lawmakers as among the most significant Congress has approved to combat climate
SpaceX owner and Tesla CEO Elon Musk (R) gestures as he arrives on the red carpet for the Axel Springer Awards ceremony, in Berlin, on December 1, 2020. Britta Pedersen | AFP | Getty Images On Tuesday, Tesla CEO Elon Musk tweeted that he considered selling his electric car company to Apple in recent years,
Jin-Woo Han is Senior Scientist at NASA’s Ames Research Center in California’s Silicon Valley. Along with colleagues Meyya Meyyappan, Myeong-Lok Seol and Jungsik Kim, he has designed a nanoscale complementary vacuum field emission transistor (VFET). In this interview Han explains why his team is interested in VFETs and the challenges involved in creating the devices
Climate change is impacting the yields of the ‘red gold‘ saffron crop from Kashmir this year. The saffron fields that were once lush in bright purple now only have the bedraggled and thin flowers that farmers woefully harvest this year. Saffron is the most expensive spice in the world. Pampore, south from Srinagar city, is
A Philippine pangolin pup nuzzles close to its mother, who is curled into a protective ball. Credit: Gregg Yan (CC BY-SA 4.0) Conservation biology 22 December 2020 The expertise of local people could help to protect an extremely rare Philippine species. The Philippine pangolin is a mammal of mystery: poorly understood, except that it is
WASHINGTON — An upgraded upper stage for the Space Launch System rocket has passed a major review, allowing its prime contractor, Boeing, to start producing hardware. Boeing announced Dec. 21 that the Exploration Upper Stage (EUS) of the SLS completed a critical design review with NASA. That review confirmed the design of the EUS, allowing
Ever wondered which sports team has the most sustainable fans? From the perspective of a rights holder, this is becoming a critical question. The answers will drive business decisions for venue operations, fan engagement and brand partnership activation. For the green sports movement, the answers may be the key to solidifying the importance of integrating
CEO of Tesla Motors Elon Musk poses during a television interview after his company’s initial public offering at the NASDAQ market in New York, June 29, 2010. Brendan McDermid | Reuters LONDON —Tesla stock is too expensive and in bubble territory compared to its performance, according to Vitali Kalesnik, partner and head of research in
After winning the US presidential election, Democrat Joe Biden moved quickly to begin naming the experts who will advise him on a range of issues — including science. He immediately announced a task force of public-health specialists who will counsel him on a strategy to curtail the coronavirus pandemic, and he has since created a
HELSINKI — China successfully carried out a first launch of the new Long March 8 medium-lift rocket late Monday, marking a small step towards Chinese rocket reusability. The 50.3-meter-long, 356-ton Long March 8 lifted off at 11:37 p.m. Eastern Dec. 21 from the coastal Wenchang launch site carrying five satellites into Sun-synchronous orbits. Launch was delayed
Taken from the December 2020 issue of Physics World. Members of the Institute of Physics can enjoy the full issue via the Physics World app. In this article (originally published in Lateral Thoughts, Physics World’s regular column of humorous and offbeat essays, puzzles, crosswords, quizzes and comics, which appears on the back page of the
Scientists have seen how the Colorado potato beetle earns its reputation as a notorious pest because of its capability of resisting various kinds of pesticides. These beetles can overcome any poison thrown at them, including DDT, mercury, dieldrin, lead arsenate, and more than 50 other pesticide chemicals. They develop resistance against each of these within only several years. How can they
Winter Solstice this year will see a rare astronomical event – the Great Conjunction of Jupiter and Saturn. True to the saying that ‘every cloud has a silver lining,’ the pandemic-ridden 2020 is bringing a year-end treat for all of us. Google is also celebrating the Winter Solstice and the Great Conjunction with its latest
The Apple iPhone 12 Pro Max LiDAR camera is unveiled. Daniel Acker | Bloomberg | Getty Images Two companies that make lidar sensors saw their stocks soar on Monday after Reuters reported on hat Apple is aiming to start production of an Apple-branded car for consumers as soon as 2024. Velodyne stock rose nearly 23%
As an emergency physician, Megan Ranney is used to dealing with hard questions about injury and illness. But during the COVID-19 pandemic, she has found herself scrambling for answers. “I kept getting asked by people whether it was safe to do certain activities,” says Ranney. “‘Is it safe to go to the beach, or to
The acquisition of Aerojet Rocketdyne will be the first test case of how the Biden administration views defense and aerospace industry consolidation. WASHINGTON — Lockheed Martin CEO Jim Taiclet said he expects the U.S. government to approve the company’s proposed $4.4 billion acquisition of Aerojet Rocketdyne despite concerns that it could reduce competition in the
Date/Time: January 25, 2021 (1-2PM ET / 10-11AM PT) Following the challenging, turbulent year that was 2020, what is the state of sustainable business in 2021? Join us for the release of the 14th annual edition of State of Green Business, GreenBiz Group’s award-winning annual report. Each year, the report looks at key trends and
A beam transformed: Optical transforms like tight focussing and total internal reflection, which gives rise to an evanescent field, can lead to out-of-plane polarization components and transverse spin, even for totally unpolarized input light. (Courtesy: Konstantin Bliokh/Diane Roth) It’s been almost a century since Wolfgang Pauli mooted the idea of “hidden rotation”: a new quantum
A new study has found evidence that exposure to metals may cause pre-term birth and low weight babies. Metals can change the concentrations of prenatal hormone composition during pregnancy, according to a study by Rutgers researchers and colleagues. Examples of such metals include arsenic, nickel, lead, and cobalt. They can disrupt the hormones of a pregnant woman while she is
Dutch scientists journeyed close to the North Pole to pursue a question that has baffled scientists for generations: Why is Rudolph’s nose red? Image Credit: Kia Krarup Hansen You may recall the most famous reindeer of all, though you might not have realized that a species of reindeer really does have a particularly rosy snout. In
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