Start-up investors have fallen in love with the transportation sector.

Why? Because this sector has handed them massive returns.

Just look at some of the start-ups we’ve introduced you to recently:

60 days after we wrote about Elio Motors — a $7,300 car that gets 84 MPG — it went…

After a certain point, you can’t get more wet.

I learned this lesson when I was 15-years-old, riding my bike through a torrential downpour to get to my girlfriend’s house.

My bike was a hand-me-down, a green 10-speed Schwinn with a squeeze horn on the handlebars.

I loved that bike:

Late last year, Amazon.com announced the use of “drones” to deliver packages.

Drones are remote-controlled aircraft. They’re mainly used for military purposes.

At the time, it smelled like a publicity stunt…

Flying saucers delivering little brown boxes of books and shampoo?

Really, Mr. Bezos?

But as…