1 The cerebrum makes up 85 percent of the brain's weight. 2  It contains about 86 billion nerve cells (neurons), the gray matter. 3  It contains billions of nerve fibers (axons and dendrites), the white matter. 4  These neurons are connected by trillions of connections, or synapses.
Making a Mammoth splash: The longest water-coaster in the world. These are the first images of the world's longest water-coaster - a ride that is guaranteed to make a splash when its (flood) gates open next year. The Mammoth, which cost $9 million (Â£5.5 million) and features a five-storey drop, will open at Holiday World & Splashin' Safari, in Santa Claus, Indiana, in May 2012.
Here are our Top 10 picks for the 2016 summer season: Standing 223 feet tall, Valravn is the 18th roller coaster to open at Cedar Point, the roller coaster capital of the world, in Sandusky, Ohio. Open in early May, Valravn claims to be the world's tallest dive coaster (223 feet), fastest dive coaster (75 mph) and the longest dive coaster (3,415 feet), with most inversions on a dive coaster (3) and the longest drop on a dive coaster (214 feet).