Released into the wild decades ago, Florida’s giant pythons have multiplied into an unstoppable force, devouring native wildlife and collapsing fragile ecosystems. Warnings issued as millions in 13 ...

One idle evening last October, Mehtaab Sawhney took up an old pastime. He began perusing the website erdosproblems.com, an updated record of the 1,179 conjectures left behind by the eccentric and ...