The practice of locating natural gas and petroleum deposits has been transformed dramatically in the last 20 years with the advent of extremely advanced, ingenious technology. In the early days of the industry, the only way of locating underground petroleum and natural gas deposits was to search for surface evidence of these underground formations.
Thumb Safety. No, the problem with a Thumb Safety is it's a Minor Motor Skill the way your brain see's it. Under a stressful situation you may loose all minor motor skills. All my guns I train with and I train consistantly, do not have any safeties.
My M&P 9 doesn't have a frame safety. I'm a Glock owner so it's no big deal to me not having a safety. Keep your finger off the trigger until you are ready to shoot: aware of the foreground, the target, and the background. My 1911 has a frame safety that I find easy to use, and not intrusive. lot of 1911 fans like the thumb safety; and want their other pistols to be like the 1911. Personally, I like an exposed hammer like the HK has. I do not like having to place my thumb on top of a thumb safety (a requirement in all tactical courses). It is uncomfortable for me.