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Bill Nye is going through a phase – a phase of matter. Check out the “Phases of Matter” episode to find out about rock-solid solids, liquidy liquids, and gassy gases.

Bill Nye the Science Guy is the hottest thing on TV.

Surf’s up for Bill Nye the Science Guy – It’s the “Waves” episode.

Bill Nye the Science Guy is all charged up for the “Energy” episode.

Get a grip – it’s the “Friction” episode.

Any ecosystem needs energy to sustain it, and the organisms within it. This energy comes in massive quantities from the Sun, although only a tiny fraction of the solar energy hitting the Earth goes towards sustaining life. The flow of energy through an ecosystem is complex, and vital to sustaining all life within it.