In the former example, you can use anything from the Civil Rights Movement to The Scarlet Letter as evidence, while the latter likely begs more for examples from personal experience or abstract arguments.

NPR: Should You Take the SAT or the ACT?

Further evidence of emerging markets' potential comes from the experience of Britain's AstraZeneca in China.

ECONOMIST: Big drugmakers�� love affair with America is coming to an end

First, it provides ample evidence, much of it drawn from the author's first-hand experience, to support its assertions.

ECONOMIST: Oil and the environment

In 2009 he used the phantom limb again to provide evidence for this theory, showing that sufferers could experience relief from phantom pain merely by watching someone else massaging or flexing their own hand.

BBC: What phantom limbs and mirrors teach us about the brain

Dr Bockting says a more appropriate standard for new identity documents would be evidence the role change is permanent and medically necessary to relieve the stress would-be transgender people experience from the conflict between their gender identity and their birth sex.

BBC: Transgender Americans take on New York