RT @TakeOnPhysics: It's pendulum time with @jcphysics and a very brave volunteer. Or are they? #physics #teaching #SPNYork http://t.co/dvhw…
RT @TakeOnPhysics: It's pendulum time with @jcphysics and a very brave volunteer. Or are they? #physics #teaching #SPNYork http://t.co/dvhw…