Articles on Biology

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Yolks are a great source of vitamins, minerals, fats and proteins packaged up by the female animal for an embryo. Emily Nunell/The Conversation CC-NY-BD

Curious Kids: why do eggs have a yolk?

A yolk allows a developing animal to stay in an egg longer, boosting its chance of survival. The downside is the mother has to work hard finding extra food so her body can create a nutritious yolk.
What’s the best way to put the brakes on current research? Okrasyuk/Shutterstock.com

A case against a moratorium on germline gene editing

Scientists and ethicists have called for a five-year moratorium on editing human genes that will pass on to future generations. Yes, society needs to figure out how to proceed – but is this the best way?
Scientific testing has zeroed in on the advantages of a zebra’s striped coat. Tim Caro

Zebra’s stripes are a no fly zone for flies

How the zebra got its stripes is not only a just-so story, but an object of scientific inquiry. New research suggests that stripes help zebras evade biting flies and the deadly diseases they carry.
Photo by Mikhail Vasilyev on Unsplash

Curious Kids: do ants have blood?

Ants have something similar to blood, but it's called haemolymph. Some insects use it in unusual ways. When threatened by a predator, blister beetles can squirt haemolymph from their knees.
Lots of positive pregnancy tests this time of year. Kristina Kokhanova/Shutterstock.com

‘Tis the season for conception

Did you ever consider that human beings might have a breeding season? Birth seasonality exists – and has interesting implications for childhood disease outbreaks.
Generations of giraffes. Shutterstock.

Curious Kids: what is a species?

It can actually be very tricky to define a species, but in the 1900s, scientists found a pretty good way.

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