I've always wondered about stupid questions like "how many of those toilet papers were sold per household?" (funny I actually found something here). For all the important things in life though, it is surprising that we have so much data available out in the open. I think we live in a glorious time.
Our World in Data - Research and data to make progress against the world’s largest problems
UN Data - A world of information
World Bank Open Data - Free and open access to global development data
Numbeo - Numbeo is the world’s largest database of user contributed data about cities and countries worldwide. Numbeo provides current and timely information on world living conditions including cost of living, housing indicators, health care, traffic, crime and pollution.
NOTE: I suspect Numbeo has some data bias (most likely upwards) but in my limited experience has reasonable ballpark estimates.
Unicorn Nest - Dataset on fundraising. Unclear how clean and helpful this is to answer questions about network effects in fundraising etc.
A list of tools that I find super useful for data visualization.