2) If someone starts typing a website, your browser recalls sites you've visited. Your wife or boss can type in 'www.hotmail.com' and your browser will recall 'www.hotdates.com'. Now that's scary!
3) Every photo on every site you've EVER visited has been copied to your harddrive! That includes all pornography you 'accidentally' looked at. Deleting the cache DOES NOT permanently remove them from your harddrive!