1 Calories Burned For Walking: 4.6 km/h (13 minutes per km). 2  Calories Burned For Walking: 4 km/h (15 minutes per km). 3  Calories Burned For Walking: 3.15 km/h (19 minutes per km).
The first true hypodermic syringe was created by Alexander Wood in 1853. He modified a regular syringe, which at that time was used for treating birthmarks, by adding a needle. He then used this new device for introducing morphine into the skin of patients who suffered from sleeping disorders.
Discovered in the late 19th century, the first clinical use of helium is indicated by a patent filed by Charles Cook in 1923 for the use of a helium and oxygen mixture (heliox) to decrease the risk of decompression sickness in divers.