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.
The MP joint of the thumb (See diagram) is vulnerable to injury and one of the most frequently is the so called 'skiers thumb' where the ligament on the inside of the thumb is torn. Further information on this injury can be found under Skiers thumb (also known as Game keepers thumb).