Installing it is more or less like installing other vinyl tiles, except that you have no adhesive. What the manufacturer's directions often fail to tell you, however, is that you need to prime the floor with a latex floor primer first.
Yeth, Hound of Pestilence, is a Unique Hellion found in the Road to Alcarnus in Act II of Diablo III. In combat, it has Desecrator, Plagued and Vortex affixes.
Ethash is the proof-of-work function in Ethereum-based blockchain currencies. It uses Keccak, a hash function eventually standardized to SHA-3. These two are different, and should not be confused. From version 1.0 Ethash has been designed to be ASIC-resistant via memory-hardness (harder to implement in special ASIC chips) and easily verifiable. It also uses a slightly modified version of earlier Dagger and Hashimoto hashes to remove computational overhead.