Peaches Geldof, 24, has has more than 160,000 followers on Twitter and has previously written columns for the Daily Telegraph and Elle Girl and articles for the Guardian.
More top news
The chief medical officer for England told ITV News that misuse of antibiotics must be curbed, and new ones must be developed.
Climate change is a pressing issue for Tonga, but has it had the attention it deserves at the Commonwealth summit?
With temperatures peaking at 29C today, it is the hottest April day for nearly 70 years.