Whats quantum tunneling?

It's the quantum phenomenon where a sub atomic particle passes through a potential barrier.

Explanation: It plays a main role in phenomena such as nuclear fusion that occurs in main sequence stars like the Sun.Has important applications in the tunnel diode, quantum computing and scanning travelling microscope.

the arctic is a region of the planet, north of the arctic circle, and includes the arctic ocean, greenland, baffin island, other smaller northern islands, and the far northern parts of europe, russia (siberia), alaska and canada.