Science teachers are extremely passionate about the subjects that they teach, but what topics outside of that subject really interest them? El Estoque asked four science teachers about what they thought was the most interesting find in all of science ― here’s what they said.

Biology teacher Lora Lerner speaks on the field of epigenetics and how the world around us can change our genes. Listen to the clip below to learn more.

Chemistry teacher Elizabeth McCracken finds brain research fascinating, especially new finds regarding neural pathway regeneration and altercation. .

Physics and chemistry teacher Mike McCrystal thinks the widespread acceptance of the existence of black holes is largely compelling given that solid evidence of them hadn’t yet emerged. 

Science department chair Biology and AP Environmental Science teacher Andrew Goldenkranz thinks the recent hominid fossil discovery in South Africa by a largely female team is the most fascinating find in science so far.