EIP-7939 adds the CLZ (Count Leading Zeros) opcode to Ethereum — turning 184-gas software hacks into a single 5-gas native instruction. This one tiny change makes log2, sqrt, powWad, MSB, compression, and ZK proofs up to 60x cheaper and dramatically smaller in bytecode. In this video we go deep: • What CLZ actually does (with animations) • Real code: before vs after (184 gas → 5 gas) • Math equations: log₂(x) = 255 - CLZ(x) • Huge wins for DeFi, fixed-point math, calldata compression • Massive ZK proving savings (cheaper than ADD in SP1!) • Fusaka upgrade timeline & client status Live on mainnet in Fusaka ~Q1 2026. Slides: Official EIP-7939: Like & subscribe for every new EIP explained before mainnet! #Ethereum #EIP7939 #Fusaka #CLZ #ZK #Solidity #Web3 #Crypto