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.
From a military jet thatâs been converted into a water-ride, to a slide that offers an up-close view of dolphins, to a tower that drops you through a floor from seven stories in the air, to the longest water coaster in the country, these are the 11 scariest and most fascinating water park attractions in the country. (Life vest not included.) 11.