1) The Earth's core is primarily composed of iron and nickel and is as hot as the surface of the sun.

2) The average person walks the equivalent of three times around the world in a lifetime.

3) The world's oldest living plant is believed to be a clonal shrub called "Old Tjikko" in Sweden, estimated to be over 9,500 years old.

4) The national flower of Japan is the cherry blossom, which holds great cultural significance and is celebrated during the annual cherry blossom festivals.