Since 2001, battery cost for electric vehicles (EVs) has been reduced by 80 percent. The cars still aren't an affordable option for most people, however, things are changing quickly. Tesla appears to be inching closer to the $35,000 price tag the company is targeting for its Model 3, which would put the EV in an affordability range on par with gas-powered cars.

Some scientists argue that aging is a social construct, not a natural law — and therefore, we can challenge it. Scientists are looking at genetic editing and advances in artificial intelligence as possible means to prolong human life indefinitely.

Despite mounting scientific evidence, there are still many people — including some very powerful people — who deny that climate change exists. Bill Nye believes that conversations based in fact, and that encourage mutual understanding are integral — but they may not be easy to have.

Researchers have found a way to increase the number of hair cells they can generate from stem cells found in mice ears from 200 to 11,500. The death of hair cells accounts for 90 percent of hearing loss, so if these newly generated cells are functional, they could restore hearing for millions of people worldwide.