Shaped charges are also used to create the holes (perfs) in wellbores prior to fracking. The shaped charges blast through 1/2 inch of steel pipe and then a foot or two of rock. Sand and water are then pumped through the holes to prop open the rock and allow oil, gas, and water to flow out with less resistance.
there was a defcon talk where they tested multiple methods for rapid hard drive erasure, in the event of a raid on a data center. a bomb range they visited happened to have a few of these leftover and
https://youtu.be/-bpX8YvNg6Y?t=2135
Let me reframe the question. How long would it take for one experienced developer to write the code for an app like Yelp. 1 day, 1 week, 1 month, 1 year?
I am assuming you are talking about Android/iOS Native Apps. From my experience, the development time for these 2 platforms are essentially the same, assuming the same level of developer for each platform.
The amount of time needed can vary a lot depending on amount of 'polish' required as well how thorough the design and specs are.
With all of that said, I would give an above average developer 2-3 months to develop something like the Yelp app. This is assuming the back-end and web services are ready and available.
