Science

• Calls to restore chalk grassland for rare insects
• How a new arrival could help save rare giraffe
• Zoo celebrates birth of second pair of Sengi pups
• Elon Musk's stratospheric rise to trillionaire status - in charts
• Elon Musk gets public trading of SpaceX under way from Texas
• Elon Musk gets public trading of SpaceX underway from Texas
• What is the super new Moon?
• First few days of new chicks hatched at osprey centre captured on camera
• 'I was employee number one': SpaceX co-founder reacts to firm's market debut
• Have you ever heard of Earthshine?
• 'I was employee number one at SpaceX'
• Watch: Three things to know about SpaceX's stock market debut
• Elon Musk's SpaceX valued at nearly $1.8tn ahead of record share sale
• El Niño under way and threatens weather extremes, scientists say
• Rare butterfly population increases by 90 times
• Pollution rules criticised for raising new home costs
• Four days of extreme rain killed 7% of world's rarest orangutans, study says
• Four days of rain slashed population of world's rarest orangutans, study says