Tin bent, a crackling sound known as the "tin cry" can be heard from the twinning of the crystals. Tin melts at low temperatures of about , the lowest in group 14. The melting point is further lowered to for 11 nm particles. β-tin (the metallic form, or white tin, BCT structure), which is stable at and above room temperature, is malleable. In contrast, α-tin (nonmetallic form, or gray tin), which is stable below , is brittle. α-tin has a diamond cubic crystal structure, similar to diamond, silicon or germanium. α-tin has no metallic properties at all because its atoms form
The Anniversary (Fawlty Towers) The Anniversary (Fawlty Towers) "The Anniversary" is the fifth episode of the second series of BBC sitcom "Fawlty Towers". As in other episodes, the letters of the sign for Fawlty Towers are shown rearranged in the opening sequence. In this episode, it says "Flowery Twats". The use of the obscene word has caused this to be given a 12 certificate by the BBFC, which is the only episode in the series to have a more restrictive rating than PG. On the morning of their wedding anniversary, Sybil recalls how Basil forgot last year. Basil has secretly invited their closest friends