Perhaps most of the tips listed in the article 12 Quick Tips To Search Google Like An Expert might be old news to you, but there may be one or two tricks in the list that you might have missed. In my case, I was unaware of the “numeric range” search, such as this one: president 1940..1950.
One tip they don’t list in the article is the unit conversion feature. For instance, give these a spin:
Feel free to try less ridiculous conversions. Or more ridiculous ones, if that’s your thing.