Stories written by

Carl Zimmer, mosaic.com

Why do we have allergies? A Yale immunologist searches for answers

Allergies such as peanut allergy and hay fever make millions of us miserable, but scientists aren’t even sure why they exist.

Carl Zimmer, mosaic.com
· Apr 19, 2015 · 08:45 am
Why do we have blood types?

More than a century after their discovery, we still don’t really know what blood types are for. Do they really matter?

Carl Zimmer, mosaic.com
· Nov 16, 2014 · 05:30 am