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Three upright walkers, including Lucy (center) and two specimens of Australopithecus sediba, a human ancestor from South Africa dating back nearly 2 million years. Image compiled by Peter Schmid and courtesy of Lee R. Berger/Wikimedia Commons

When and how was walking invented?

Walking has taken a very long time to develop, with evidence of bipedalism among early humans in Africa roughly 4.4 million years ago.
Ancient military innovations – like the bit and bridle that enabled mounted horseback riding – changed the course of history. Osama Shukir Muhammed Amin/British Museum via WikimediaCommons

The horse bit and bridle kicked off ancient empires – a new giant dataset tracks the societal factors that drove military technology

Did ancient technological advancements drive social innovation, or vice versa? Studying cause and effect in the ancient world may seem like a fool’s errand, but researchers built a database to do just that.
Bacteriophages are viruses that infect bacteria and play a potential role in the evolution of life. NANOCLUSTERING/SCIENCE PHOTO LIBRARY/Science Photo Library via Getty Images

Viruses are both the villains and heroes of life as we know it

Viruses have gotten a bad rap for the many illnesses and pandemics they’ve caused. But viruses are also genetic innovators – and possibly the pioneers of using DNA as the genetic blueprint of life.
Some institutions publish information about their mishaps, while others do not. Peter Kneffel/picture alliance via Getty Images

Reporting all biosafety errors could improve labs worldwide – and increase public trust in biological research

A centralized reporting system for laboratory incidents involving dangerous pathogens in biological research does not exist in the US or internationally.
Perseverance took a selfie next to its biggest accomplishment yet – the two small drill holes where the rover took samples of Martian rocks. NASA/JPL-Caltech/MSSS

Perseverance’s first major successes on Mars – an update from mission scientists

Perseverance and its helicopter sidekick, Ingenuity, have been on Mars for nearly nine months. The duo have taken rock samples, performed first flights and taken images of the delta in Jezero Crater.