African American workers are at greater risk as they're over-represented in the jobs that will face the most cuts from increased automation.
The American higher education system is one of the most expensive in the world, costing on average more than $25,000 a year. But many countries allow students to pursue education for free.
In a ranking of the world's 25 most competitive economies, Singapore now comes top - and the UK has dropped three places to 23.
This year, ahead of choosing MIT Technology Review's breakthrough innovations, Gates read 10 books on tech that helped inform his choices.
