Evolutionary biologist Richard Dawkins asks if science can provide answers to the big questions we used to entrust to religion

http://www.channel4.com/programmes/sex-death-and-the-meaning-of-life

All three episodes may be viewed on YouTube unless they happen to be taken down. 
Episode 1: Sex.     https://www.youtube.com/watch?v=mHhSYyvI-5k&list=PLB4uoi02B2hPwxZsIP3yPmBGKxwHZ3USu&index=1&feature=... 

Episode 2: Death.     https://www.youtube.com/watch?v=kEclvp40KHU&list=PLB4uoi02B2hPwxZsIP3yPmBGKxwHZ3USu&index=2&feature=...

Episode 3: The Meaning of Life.     https://www.youtube.com/watch?v=3w71PAo8zT4&list=PLB4uoi02B2hPwxZsIP3yPmBGKxwHZ3USu&index=3&feature=...

If the links above don't work inside of the UK, try these
Episode 1: Sex.     bit.ly/V4GotW
Episode 2: Death.     bit.ly/TTmvGf
Episode 3: The Meaning of Life.     bit.ly/RtN14I