It's been a while since 81-year-old Gerd Kumbier has set foot in a classroom, but he's hitting the books once again to help homeschool his great-granddaughters while the coronavirus keeps German schools closed.
In a flat in Berlin-Hellersdorf, on the eastern outskirts of the capital, Kumbier is bent over nine-year-old Leyla's German notebook, watching in deep concentration as she practises her cursive writing.
