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The prime minister of New Zealand, Jacinda Ardern, has reaffirmed that her government will move quickly to change gun laws following the attack on mosques in Christchurch in which fifty people were killed. Speaking ahead of a cabinet meeting, she said New Zealanders were asking why people were able to buy military-style, semi- automatic weapons.

A tropical storm which swept across eastern Zimbabwe on Saturday is now known to have killed more than sixty people. A further two hundred are missing. Cyclone Idai swept away homes and destroyed roads and bridges, hampering relief efforts.

The United Nations has named this year as international year of the periodic table of chemical elements. It's because this month marks exactly 150 years since Dmitri Mendeleev created what we all now recognise as the periodic table.