You put the merry in my Christmas.

The worlds tallest free fall rollercoaster is The Giant Drop located in Australia. The drops is 120 meters which is equivalent to a 39 storey building.

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The maximum number of bitcoins is still 21 million, but it is now estimated that the last bitcoin will be mined in 2040, This is because the block reward for mining bitcoins is halved every 210,000 blocks, which happens roughly every four years.