February 12th is Darwin Day to celebrate the birthday of the great man himself, Mr Charles Darwin. Evolution has been under attack since the day Darwin published his book On the Origin of Species in 1859.
The amount of evidence which supports Evolution is overwhelming, but there is still a movement of people who advocate Intelligent Design (creationism) who try and discredit the evidence. This is a real bugbear for myself and for many other teachers of Science. Imagine if you are a maths teacher and a group of people who believed Pythagoras was wrong tried to make you teach “both sides of the hypotenuse argument”. Or that you are a geography teacher and the flat earth society tried to force you to teach “both sides of the Globe argument”.
For a comprehensive roundup of the wealth of evidence which supports evolution, you can’t beat the Talk Origins website.
Some guidance on the teaching of Evolution in the classroom can be found here on Teachernet:
If questions or issues about creationism and intelligent design arise during science lessons they can be used to illustrate a number of aspects of how science works. Such aspects include: ‘how interpretation of data, using creative thought, provides evidence to test ideas and develop theories’; ‘that there are some questions that science cannot currently answer, and some that science cannot address’; ‘how uncertainties in scientific knowledge and scientific ideas change over time and about the role of the scientific community in validating these changes’.

Here are some websites that will be of use to teachers to help teach Evolution in the classroom:
Here’s an audio guide to the life and times of Charles Darwin and more excellent resources from The Guardian here.
Here’s an amazing interactive Tree of Life from the Wellcome Trust.
This Evolution website, tied in with a PBS television series, contains lots of resources about Darwin and Evolution : http://www.pbs.org/wgbh/evolution/ Plus links to guidance for teachers (in the US, but valid elsewhere) on teaching Evolution in the face of Intelligent Design claims.
Understanding Evolution is a non-commercial, education website, teaching the science and history of evolutionary biology. This site is here to help you understand what evolution is, how it works, how it factors into your life, how research in evolutionary biology is performed, and how ideas in this area have changed over time.
They also have a special site for K-12 Teachers: Understanding Evolution for Teachers.
Another useful website, when faced with statements such as “Evolution is Just a Theory” is this one: http://notjustatheory.com/
Also check out this blog post from Snapshot Science, which has some other useful links and ideas for teaching about Evolution.
Happy Birthday Darwin!