(Video sponsored by @Mack Weldon) Why does armpit sweat stink, but arm sweat does not? There are two main types of sweat glands in your body: apocrine (stinky) and eccrine (not stinky). The difference is that apocrine sweat is rich in lipids and other nutrients, which is good food for some types of bacteria that turn it into stinky byproducts! So, the armpit sweat itself is actually not stinky, but it is after the bacteria have eaten it! This shirt is the 37.5 in blue yonder from Mack Weldon. It has a strip of material called 37.5 in the armpit, which helps keep the area cool and breathable... which reduces armpit sweat.. which means I am a bit less stinky than I would otherwise be! I wear this shirt pretty much all the time, and can easily recommend that you check it out. Use code DRNOC20 for 20% off orders of $100+! #science #todayilearned #TIL #drnoc #mackweldone #menstyle