Planets
Pluto is no longer a planet — or is it?
In the 15 years since Pluto lost its status as a planet, some scientists continue to use whatever definition works best for them.
Word of the Week
Plants
Scientists Say: Phloem
Phloem is tissue that delivers food, made in leaves during photosynthesis, to the rest of a plant.
Explainers
Genetics
Explainer: What is RNA?
A partner to DNA, cells use this molecule to translate the instructions for making all of the many proteins that your body needs to function.
Analyze This!
Animals
Analyze This: Some female hummingbirds go undercover
Some female white-necked jacobin hummingbirds boast bright blue colors similar to males. That may help females blend in to avoid attacks.
What's Hot
The Coronavirus Pandemic
Watch This
A giant tortoise is caught hunting and eating a baby bird
New video captures the first recorded instance of a tortoise hunting another animal.
