A+E Networks. On this day in 1969, Americaâs first automatic teller machine (ATM) makes its public debut, dispensing cash to customers at Chemical Bank in Rockville Center, New York.
This modification of the energy levels of a hydrogen atom due to a combination of relativity and spin-orbit coupling is known as fine structure.
The two sides of DNA are held together by hydrogen bonds. These bonds contribute to the characteristic double helix structure first proposed by scientists James Watson and Francis Crick in 1953. Hydrogen bonds are formed between four nitrogenous bases found within DNA.