World yo-yo championship first place winner

If you think you’ve seen some incredible slights of hand or even some groovy yo-yo tricks, think again.  Jensen Kimmitt has redefined the “sport” and this video defies imagination:

The science of dinosaur killing machines

The science of dinosaur killing machines – “Claws, Jaws and Spikes: The Science of the Dinosaur Arsenal” http://ht.ly/2rkkp #science

Dinosaur