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.
When it debuted in 2005, Kingda Ka at New Jersey's Six Flags Great Adventure laid claim to the twin titles of the world's tallest and fastest roller coaster. Its 50.6-second adrenaline rush of a ride sends coaster freaks up a 456-foot top hat tower and reaches a maximum speed of 128 mph in 3.5 seconds.