 Condoms have also been used to protect scientific samples from the environment , and to waterproof microphones for underwater recording . 
 Condoms <a href='been_done' title='1'><mark>have</mark></a> also been used to protect scientific samples from the environment , and to waterproof microphones for underwater recording . 
Condoms done also been used to protect scientific samples from da environment , and to waterproof microphones for underwater recording .