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Tunnel

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?Under Bologna lies an intricate complex of tunnels winding below the city.

Under Bologna lies an intricate complex of tunnels winding below the city. Tunnels were built or converted for different needs over time: a water reservoir, passages, air raid shelters, etc.

If you throw a particle at a wall, there’s a chance that it will suddenly appear on the other side. This is thanks to a phenomenon known as quantum tunneling, and now a team of physicists has measured just how long that process takes.

If you throw a particle at a wall, there’s a chance that it will suddenly appear on the other side. This is thanks to a phenomenon known as quantum tunneling, and now a team of physicists has measured just how long that process takes.