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Photograph: Hepta/Barcroft Media Consumers are to be asked whether they will accept traces of horsemeat in their food if it proves too costly and technically difficult to check thoroughly for levels of contamination under 1%.

We explicate the various "thlons" - penta, deca and hepta.

Above 39� C., however, the hexahydrate, with six molecules, is less soluble, and a rapid conversion of the hepta- into the hexahydrate occurs if the former is heated above the transition point.

Heptad, a term in chemistry to denote an atom that is the equivalent of seven atoms of hydrogen, from hepta, seven.

Now the Greek for seven, hepta, has only four characters, the aspirate being marked over the initial vowel.