After Michael Martin becomes the highest-profile casualty of the scandal over MPs' expenses, sketchwriter Simon Hoggart looks back at his record as Speaker of the House of Commons. Severin Carrell gets the reaction from voters in Martin's Glasgow North East constituency.
After the Speaker's resignation, what now? Commentator Martin Kettle assesses reforms of the system of MPs' allowances.
Environment website editor James Randerson examines the implications of the discovery of a fossil – nicknamed Ida – that scientists believe provides a crucial link between human evolution and that of other mammals.
Barack Obama has announced new rules on car-exhaust emissions that will curb greenhouse gases. Our US environment correspondent, Suzanne Goldenberg, says it's an important step towards creating a clean economy.
And Matthew Soper tells gardening editor Jane Perrone about his display of carniverous plants at the Chelsea Flower Show.
