- The first electric battery called the “voltaic pile” was invented by Alessandro Volta in 1799.
- Alessandro Volta (1745 – 1827) was an Italian physicist, chemist and a pioneer of electrical science.
- He discovered methane mixed with air could be exploded using an electric spark, “contact electricity” resulting from contact between different metals, and electric potential in a capacitor is directly proportional to electric charge.
- In recognition of Alessandro Volta’s contributions to electrical science, the unit of electric potential is called the volt.
In humans there are 13 vitamins : 4 fat-soluble (A, D, E, and K) and 9 water-soluble (8 B vitamins and vitamin C). Water-soluble vitamins dissolve easily in water and, in general, are readily excreted from the body, to the degree that urinary output is a strong predictor of vitamin consumption.
- The hot air balloon is the oldest successful human-carrying flight technology.
- French brothers Joseph-Michel Montgolfier (1740 – 1810) and Jacques-Étienne Montgolfier (1745 – 1799) built the first hot air balloon out of cloth and paper.
- They discovered that a fabric bag filled with hot air would rise.
- Modern hot air balloon lifted off in 1783 with a demonstration in front of King Louis XVI, Marie Antoinette, and a crowd of 130000 in Annonay, France.