Nigel Slater, the food writer who makes your mouth water, has turned his attention to liquid lunches (and speedy breakfasts in a glass, and after-school pick-me-ups). Thirst, his new guide to juices and smoothies, is overflowing with healthy fruit and veg ideas.

We have five copies of Thirst, published by 4th Estate at pound;12.99, for Friday readers. Write to Tracey Thomas, Thirst offer, Friday magazine, 66-68 East Smithfield, London E1W 1BX, or email friday@tes.co.uk by June 28.

Bag a book

With this week’s Aventis Book Awards showcasing new popular science writing (see page 29), we have a stack of bestselling science paperbacks to give away. Send your first and second choice from: The Code Book: the secret history of codes and code-breaking by Simon Singh (Fourth Estate); E=MC2: a biography of the world’s most famous equation by David Bodanis (Pan Macmillan); Genome: the autobiography of a species in 23 chapters by Matt Ridley (4th Estate) and Mendeleyev’s Dream: the quest for the elements (Penguin) and we’ll do our best to send the book you want as supplies permit. Write to Science paperbacks offer, Amelia King, Promotions department, TES, 66-68 East Smithfield, London E1W 1BX, by June 28.

Take the biscuit

Fancy a breaktime treat for your staffroom, department or school office? Think you know your Rich Tea from your Hobnobs? Pool your brain power to answer our quiz (think biscuit for one of the five answers) and you could win two classy tins of organic Duchy Originals.

1. What is made from the juice of latex of the sapodilla tree?

2. Which famous 19th-century male fashion icon died a pauper in a French asylum?

3. What is urticaria better known as?

4. Who is Scooby Doo’s nephew?

5. In 1998 Britons spent pound;1.8 billion on what?

Answers from June 7: 1. 10 to the power of 100; 2. Argentina; 3. Fig rolls; 4. Marine biology; 5. Babylonian epic poem, thought to be the world’s oldest literary work. Congratulations to Linda Webber, Jonestown, Carmarthen.

Send your answers on a postcard to:Tracey Thomas, Take the Biscuit, Friday magazine, 66-68 East Smithfield, London E1W 1BX or email: friday@tes.co.uk by June 28. The first set of correct answers out of the hat will take the biscuits - supplied by Duchy Originals. Teaching materials about organic food and farming are at www.duchyoriginals.com