Today's sample programmes from this year's undergraduate calendar look at Business and Biology.

12.30 Accounting and Finance for Managers: Keeping the Lines Open
The flow of financial information within organisations is often complicated. This programme looks at one group of companies, and asks how they know that they have got it right.
(R)

12.55 Animal Physiology: Deep Secrets
The sperm whale can dive to nearly a mile and a half, and remain submerged for an hour on a single breath. How is this extraordinary feat achieved?
(R)