A clay votive sculpture of a uterus
Written by: 
Emily Santora
A lot of illnesses, like colds, have very visible symptoms, but other conditions are not so obvious. Learn about how people spot and treat a condition called endometriosis.
Someone raising their arm to show off armpit hair
Written by: 
Risa Aria Schnebly
Our biological sex is mainly controlled by our sex chromosomes. But sex hormones also influence what body parts and characteristics we have.
Fingers holding a menstrual cup
Written by: 
Emily Santora
Periods are a natural, normal part of life, and many people around the world experience them. So let’s talk about why and how they happen.
gastrulation and the germ layers
Written by: 
Claudia Nunez-Eddy and Risa Aria Schnebly
Almost all life forms start out as small cells, but how do they grow into entire animals? Read about the first step here: when cells in an embryo form germ layers that give rise to every organ and tissue in the body.
Learn all about cicadas
Written by: 
Tyler Quigley
Every so often, cicadas rise up from their quiet underground burrows to “sing” their best ballads. Aside from their sound, what do you know about the patient, musical lifestyle of these insects?
Does social distancing work?
Written by: 
Kyle Polen and Sarah Weiss
How well does social distancing work to control a global pandemic? With people’s lives turned upside-down due to COVID-19, many have been left to wonder if social distancing is worth it.
A video game air craft fights off pathogens
Written by: 
Challie Facemire
Cancer, damaged DNA, COVID-19... our bodies deal with diseases and damage all the time, and finding that damage as early as possible can be helpful to fighting it. Joshua LaBaer has dedicated his career to solving health puzzles, and learning how to detect diseases earlier than ever before.
Wildfire illustration
Written by: 
Andrew Burchill
As our climate changes, wildfires seem to become more and more damaging. But are wildfires automatically bad? And how can we learn to live with a future filled with fire? Also in: Français
How do bacterial cells handle damage when they divide?
Written by: 
Daphne Newell, Jadon Gonzales and Danielle Brister
Instead of giving birth to a child, bacteria divide in half when they grow old, creating two new bacteria cells. But bacteria become damaged as they age just like humans do, so where does all this damage go?
COVID simulation illustration of the COVID SIM title on a map, showing people

Explore COVID SIM.

In the COVID-19 pandemic, how much does wearing masks and distancing matter? How important is it to get vaccinated? You can now explore and visualize these questions as you figure out how you could slow the pandemic.

To learn the latest about the COVID vaccines, the number of people who have been vaccinated, and more, visit our story page COVID-19 Vaccines.

Also in: Español

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