Which Works Faster- Null Coalescing Operator or GetValueOrDefault or Conditional Operator – A simple benchmark test to check which one is faster: Null Coalescing Operator ??, GetValueOrDefault method or Conditional Operator ?: The conclusion is that if you want to return a default value different than the default for the current nullable type the best choice is ??. If you want to return the default value the GetValueOrDefault is a little more faster.
Go and check the link, it is nice work, you would find great explanations and some charts generated by the benchmark results.
Why Google Wants to Sell Its Robots: Reality Is Hard
Software is far easier to develop and test than hardware. The robots need time to learn continuously and require fundamental research in a number of areas.