Parents were reunited with their children in Nigeria's northwestern Kaduna on Sunday after kidnappers released 28 children taken from a school earlier this month - but dozens more are yet to return.

Pfizer-BioNTech will ship the first 40 million coronavirus vaccines to poorer nations next month. The WHO's COVAX scheme is aimed at 20% of vulnerable populations this year.

Here are a few reasons to pick up a copy of The Guardian on Saturday. Find these stories and much more when you grab a copy of The Guardian on Saturday.⁣

January was established as the first month of the year by the Roman Calendar. It was named after the god Janus (Latin word for door). Janus has two faces which allowed him to look both backward into the old year and forwards into the new one at the same time. He was the 'spirit of the opening'. To many, January is like 331 days instead of the 31 normal days, the longest month of the year. But the big question is, is January really the longest month of the year?

After Africa was declared polio-free last month, Afghanistan and Pakistan are now the only countries in the world where the disease is found. Why is polio surging in Pakistan and what can be done to curb the disease?

At least 11 people are left dead and 20 are missing after a landslide hit several neighbourhoods in Manizales, Colombia, in the second deadly landslide in the country this month.