61K views · 399 reactions | The “huge shock to children’s learning” will require a radical approach, and “a long and sustained” programme of initiatives to support students, the government’s education catch-up tsar, Sir Kevan Collins tells BBC Newsnight. bbc.in/37MNxcJ | BBC News | Facebook

Proteins are made of 20 amino acids, each with a unique side chain (R group) that defines how proteins fold and function. These amino acids are linked by peptide bonds to form polypeptides, which fold into complex 3D structures. Protein structure has 4 levels: 1️⃣ Primary – amino acid sequence 2️⃣ Secondary – α-helix & β-sheet 3️⃣ Tertiary – 3D shape from side chain interactions 4️⃣ Quaternary – multiple polypeptides forming one unit They’re classified based on side chain properties: nonpolar, p

1.7M views · 23K reactions | Challenge the construction of wooden arcade bridge structure, and protect the heritage of Chinese mortise and tenon joints挑戰木拱廊橋架構搭建，中華榫接守護【阿木爷爷Grandpa Amu】 #阿木爷爷GrandpaAmu #手工 #工藝品 | 阿木爷爷Grandpa Amu | Facebook