#1740 12.03.2023 15:25 AP

Sky Lights: How We Knew Space Was a Vacuum (2021)

But if you’re looking for “absolute proof” it was in the mid-1940s when Germany fired V-2 rockets across the English Channel from Peenemünde. These rockets were the first to reach outer space (top graphic). Near the apex of their flight they were observed to move along a ballistic trajectory — motion in which gravity is the sole acting force. Ballistic motion can only happen in a vacuum.

#1674 19.02.2023 15:25 AP

Wired: What's Up With That: Why It's So Hard to Catch Your Own Typos (2014)

Touch typists are working off a subconscious map of the keyboard. As they type, their brains are instinctually preparing for their next move. "But, there's a lag between the signal to hit the key and the actual hitting of the key," Stafford said. In that split second, your brain has time to run the signal it sent your finger through a simulation telling it what the correct response will feel like. When it senses an error, it sends a signal to the fingers, slowing them down so they have more time to adjust.

#1661 16.02.2023 22:49 AP

Phys.org: Scientists find first evidence that black holes are the source of dark energy

The measurements from ancient and dormant galaxies show black holes growing more than expected, aligning with a phenomenon predicted in Einstein's theory of gravity. The result potentially means nothing new has to be added to our picture of the universe to account for dark energy: black holes combined with Einstein's gravity are the source.

#1647 14.02.2023 00:10 AP

Scientific American: Let Teenagers Sleep

Despite decades of research, thousands of publications and clear science, schools in only a few states and the District of Columbia have pushed their start times to 8:30 A.M. on average, which researchers say is a compromise—a better time would be closer to 9 A.M.

#1610 03.02.2023 11:04 AP

University of Adelaide: Seawater split to produce green hydrogen

“We have split natural seawater into oxygen and hydrogen with nearly 100 per cent efficiency, to produce green hydrogen by electrolysis, using a non-precious and cheap catalyst in a commercial electrolyser,” said Professor Qiao.