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.
1Kingda Ka: the world's tallest and fastest roller coaster. Arms down, head back and hold on. With only 28 seconds, the Kingda Ka may not be very long, but it's bound to leave you wide eyed and twitching. Located at Six Flags Great Adventure in New Jersey, USA, it's the tallest and fastest roller coaster in the world. The train is launched by a hydraulic launch mechanism to 128 miles per hour (206 km/h) in 3.5 seconds.