1 If the invitation says black tie, women should wear a floor-length, evening gown. 2  A tuxedo is mandatory if you're a man. 3  This is your chance to dress as if you were headed to the Oscars. 4  Black tie optional means that wearing a tuxedo or long evening gown is not mandatory, but guests should feel free to do so.
Ether is an organic functional group consisting of a disubstituted oxygen, or an oxygen atom bonded to 2 carbon atoms (if adjacent to a ketone, functional group is then called an ester).
Ether is the native token of Ethereum, and serves 2 key purposes: 1  First, by requiring applications to pay Ether for every operation they perform, broken or malicious programs are kept from running out of control. 2  Second, Ether is given as a reward to those who contribute their resources to the decentralized network.