Explainer

How did Elon Musk go from being an Obama supporter to a self-described "dark MAGA" Trump ally? Here's a look at the relationship between two billionaires ahead of the second Trump presidency.

Limos used to be the snazzy way of moving around town, but now luxury transportation is being redefined. Here's what happened to the limo and what's replacing it.

Could one pill help us live longer? Scientists and investors are racing to find a drug to slow aging, trying things like metformin and rapamycin. But the breakthrough might not come from humans.

Megabus was once known as an affordable travel service, but its parent company, Coach USA, has filed for bankruptcy. The bus industry is half the size it used to be. Can bus travel be saved?

Billionaires are backing top scientists racing to develop tech that could reverse aging. Cellular reprogramming promises to rejuvenate the body — but how does it work, and is it safe?

What do we get wrong when we talk about ocean plastic? A lot, it turns out.

Business Insider producer Elizabeth McCauley dives into the scientific literature and talks to experts to find out how we actually solve this problem.