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A northern white rhinoceros  has died at a San Diego zoo, leaving only five worldwide and bringing the species closer to extinction

Going to bed late can increase negative thinking Are you a chronic worrier? The hour you’re going to sleep, and how much sleep you’re getting overall, may exacerbate your anxiety, according to a new study published in the journal Cognitive Therapy and Research.

Math Extravaganza Accelerates Study and Retention of Science Most high school sophomores participating in November’s “Skatepark Mathematics Extravaganza” thought parts of their campuses were turned into X Games-style skate parks, but to UTEP’s Bill Robertson, those skate parks were outdoor research labs.

When worlds combine, the possibilities are limitless In the early days of the environmentalist movement, the line was sharply drawn between the tree-huggers and the suits. People had to choose between the two shades of green – the planet or the money.

The Ocean Spiral, an underwater metropolis that generates energy from the seabed and is capable of providing homes and accommodation for 5,000 people. Sure, such blue-sky thinking may only seem plausible in the world of Hollywood CGI, but this is the futuristic concept proposed by Japanese construction firm Shimizu Corp. According to literature released by the company, expertise is being sought from Tokyo University, Japanese government ministries as well as energy firms to bring the project to life.

  The two hostages who died in the Sydney siege have been named as Katrina Dawson, 38, and the manager of the Lindt cafe Tori Johnson, aged 34. The gunman at the centre of a 16-hour siege at a cafe in Sydney's CBD was also killed. Ms Dawson was a Sydney lawyer and mother of three and Mr Johnson had worked at the Lindt cafe since October 2012.