Don't you just have a phone or something? Everybody has a phone, if not your dad should. Use that camera on that and give us a picture that shows the situation. Sometimes the situation can't just be understood correctly and you may end up even damaging it.
Most ads are from Google Adsense. What it does is that it tracks you and remembers what you look at. You must've searched for some kind of porn and that's why it shows that.
Use the Chrome's porn mode Aka incognito mode.
Actually, it depends on the monitor you're using. If you are using a Monitor that flickers* then it can cause severe eye strain, headaches and what-not.
*flickering happens and depends on your Refresh Rate(Hz) of your Monitor.
Dude, the cores are at the center of the CPU. You don't have to cover all the surface area of the CPU. Some can be left. As it won't be that hot there. The purpose of thermal paste is to transfer the heat from the cores to your Cooler. It doesn't matter if the whole cpu is covered. A bit can be left uncovered. It doesn't really matter.
You should buy BF4 now and get better and better at it. And after when you get the hang of the game, buy Hardline if you feel like it. Hardline does have potential to be a good game, and finally the devs behind it are listening to the public.