If you enjoyed this podcast, we highly recommend the 2 books suggested opposite. And in addition to those...
The Chislehurst caves that Andy talked about are just a short way out of London, while Cheddar Man's famous cave dwelling is always worth a visit.
There is a huge number of people - estimates vary on how many - living underground in Beijing - and not in luxury cave-dwellings (for those, see video opposite).
Here's the full story behind that kiss.
Listen to this to learn more about selling your soul in Latvia, and read this for more on the man who tried to weigh the soul.
This excellent archive, full of original sources from the period, tells the story of George Washington's purportedly 161-year-old nanny.
What to do about the snakes on Guam? Attack them with mice.
The female Pennsylvanian grass spider eats one male to seduce the other, while the male redback spider flirts by offering himself up as a meal. Then of course, there are octopuses that eat themselves and the sharks that eat each other in the womb.
And finally, join the debate: who is better at sex, the lion or the ladybird?
On the Map: Why the World Looks the Way it Does
Where the fact about the Mountains of Kong came from - a fascinating and entertaining book that tells the story of maps.
Riding the Iron Rooster
Mentioned by Dan, this is a wonderful piece of travel writing for anyone with an interest in China.
Barbara's 160 Unpublished Novels
The chair that's older than flowers
...where you might just bump
into his grandson!