Common sence, don't download any suspicious files and you should be fine. And use chrome browser it is the most secure
Certificates
An underground aquifer would provide the best protection against a water shortage caused by drought.
An underground aquifer would provide the best protection against a water shortage caused by drought.
An all weather shutter type would be the best for protection against rain and mold.
Seatbelt
The best protection is a good UPS (Uninterruptible Power Supply). That will protect you against both surges and brown outs, as well as allowing you to power down safely in case of a power outage.
Concrete, lead
UTP
Depends. There are other methods that are more reliable WRT pregnancy. But condoms are the best protection against STDs.
A U-lock is considered the best type of bike lock for maximum security and protection against theft.
lake
A few inches of lead