children in states where medical marijuana is legal. two states, colorado and washington also legalized all forms of marijuana including recreational use. >> on september 24th, the new jersey 4-year-old died in his sleep. it was the first death health officials can lead to enterovirus. by the time the scare settled down evd-68 had sickened hundreds of children in nearly all 50 states. without a doubt, the biggest health headline of the year, ebola. >> ebola. >> ebola. >> ebola. >> you've been exposed to ebola while in liberia. >> what began as a single case in guinea last december has grown into an epidemic of unprecedented proportions. two aid workers, dr. kent brantly and nancy writebol were medevac'd back to the united states from liberia. they survived followed by others thanks in part to the selfless work of doctors, nurses and other healthcare workers who