TechnologyJeremy Hunt's magical plan to block sexting is no help for teensLike most visions of technology as a magic wand, UK health secretary Hunt's proposals sound easy but offer as many problems as solutionsAnalysis
SpaceElon Musk's spectacular plan to colonise Mars lacks substance The SpaceX founder wants the first humans on Mars by 2024, but his showboating scheme is lacking in both details and funds, says Lisa Grossman Analysis