Thank you for visiting nature.com. You are using a browser version with limited support for CSS. To obtain
the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in
Internet Explorer). In the meantime, to ensure continued support, we are displaying the site without styles
and JavaScript.
USDA's “payment-in-kind” programme has had a stunning — and expensive — success in getting farmers to grow less. Good research would have been a better investment.
Molecular biology is revealing an extraordinary array of new, potential hormones. The problem is how to determine their physiological functions, if any.