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Tyrannosaurus rex spanned all of ancient North America, and about 20,000 lived at once. Roger Harris/Science Photo Library vie Getty Images

How many Tyrannosaurus rex walked the Earth?

Using the incredible wealth of fossil data and a modern ecological theory, researchers estimated population density for the extinct apex predator.
The colors in this microscope photo of a fruit fly brain show different types of neurons and the cells that surround them in the brain. Sarah DeGenova Ackerman

Astrocyte cells in the fruit fly brain are an on-off switch that controls when neurons can change and grow

Adaptable neurons are tied to learning and memory but also to neurological disorders. By studying fruit flies, researchers found a mechanism that controls neuroplasticity.
While professional sports franchises have become more socially conscious, LGBTQ fans and players aren’t exactly embraced with open arms. Adam Glanzman/Getty Images

Sports remain hostile territory for LGBTQ Americans

Half of LGBTQ participants in a recent study experienced discrimination, insults, bullying or abuse while playing, watching or talking about sports.
This skull, found in France, was among the first fossils to be recognized as belonging to our own species. DEA /G. Cigolini via Getty Images

How did humans evolve, and will we evolve more?

Our biggest evolutionary advantages are an ability to walk on two legs and our big brains.
Project-based learning gets kids to explore natural phenomena and solve real-world problems. Luis Sinco/Los Angeles Times via Getty Images

Project-based learning deepens science knowledge for 3rd graders in Michigan

Students who took part in the program scored 8% higher on the state science test than students who received traditional instruction, and demonstrated greater social and emotional learning.
Sewage samples mixed with magnetic beads and loaded onto the liquid-handling robot for viral concentration. C. H. Sheikhzadeh @ HOMA Photographic Art

Sewage-testing robots process wastewater faster to predict COVID-19 outbreaks sooner

A community’s wastewater can predict coronavirus cases that haven’t yet been diagnosed. The quicker that information is known, the better.

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