These T-cells were converted into stem cells, which could dramatically increase in number when grown in the laboratory.

BBC: Immune system 'booster' may hit cancer

We should help foreign graduates and foreign professionals, particularly in science, technology, engineering and mathematics, through an increased number of available H-1B work visas and a STEM green card program.

CNN: Give more visas to foreign-born workers

She also said the plan might have the unintended consequence of reducing the number of students studying science, technology, engineering and maths - the so-called STEM subjects - because students tend to get higher grades in the arts and humanities.

BBC: Top students expansion plan 'could hit social mobility'