neiture:

Nā Pali Coast, Kauaʻi | image by paul (dex)

(Source: ecocides)

particle collision

(Source: 10uhclock)

Human lungs: Together, the lungs contain approximately 2400 km (1500 mi) of airways and 300 to 500 million alveoli, having a total surface area of about 70 m² (8,4 x 8,4 m) in adults — roughly the same area as one side of a tennis court.^[1] Furthermore, if all of the capillaries that surround the alveoli were unwound and laid end to end, they would extend for about 992 km (620 mi)

j-p-g:

富士山写真 001 (EOS 40D) (via akimoto watari)