Must-see videos of the week – July 19

From a solar-powered boat attracting crowds in Halifax to a brilliant three-year-old who is now a member of Mensa, we've see some great videos this week. Here are some of our favourites:

1. Massive solar-powered boat docks in Halifax

A 35-metre long completely solar-powered boat arrived in Halifax this week as part of a scientific voyage. Researchers say the boat could be a key to unlocking secrets of the sea and climate change. Because the ship doesn't produce any pollution, scientists can get the most accurate measurements possible. The ship, which looks like some sort of UFO, is called MS Turanor PlanetSolar and has 520 square metres of solar panels. In May, it completed the first solar-powered trip around the world in 584 days.

[ Last week's must-see video: Mannequin on U.S. billboard alarms motorists ]

2. Fireworks warehouse goes up in flames

A fireworks warehouse in Indiana caught fire Wednesday night sending fireworks shooting into the air and causing traffic to crawl as many stopped to look. Fire officials are still trying to figure out what caused the fire, which burned down the whole building. Firefighters dousing the flames were forced to dodge fireworks at the same time. No injuries were reported.

3. Whitewater rafter rescued after going overboard

Two people were thrown from a raft as it went down a four-metre drop in rapids on a river in Washington. One of the rafters was able to cling to the raft and be pulled back in while the other hit the water hard and apparently was knocked unconscious. While the one rafter was floating down the river, an experienced guide at the side of the river jumped into the river and managed to pull the unconscious rafter to rocks on the side. After a couple minutes on the rocks the man regained consciousness. Apparently, he forgot to hold on when he went down the rapids.

[ More Daily Buzz: B.C. missing person found 52 years ]

4. Tubby tortoise needs special scale for weigh-in

People are sometimes scared to step on the scale, nervous of weight gain, but not this Galapagos tortoise. Australian Reptile Park officials use the tortoise's weight to measure health, however getting him on the scale was no easy task. It took four men and a forklift to get him to a factory with a scale that could handle his size.

5. Girl, 3, joins Mensa

Selena Janik of Tennessee is only three years old, but already a member of the elite high-IQ society, Mensa. Her parents say they knew Selena was special shortly after her birth because she stopped crying quickly. When they realized she was showing early counting and reading skills, they got her IQ tested and she scored in the top one per cent. Mensa only accepts people with an IQ in the top two per cent. As for her future, according to USA Today Selena's mother said she has already expressed interest in becoming a scientist.