Why Are My Plants Doing This?

Notices how the leaves are twisting. Then in the third pic the tips are drooping down. Also notice the slightly yellow stem in the third. The plants are 16 days old.

Because they can and it drives you nuts. They just want to see if your paying attention and will leave your hands off them while they grow.

sometimes they will twist and split and divide to form the 5 to 13 leave pattern that is familiar to marijuana

Errr.... I wouldnt worry about those bottom leaves. They should be dying off eventually anyway. And thats not yellowing thats fresh baby green newgrowth give it a wiff it should smell like pure planty goodness.

i hate the smell of plants, when they 1st grow, Plant smell with the smalled touch of mJ. even after you pick them, ive had this plant picked and put in a airtight double sided plastic sheet. it still smells the same lol, more i smell it the better it smells.