Our weekly news round-up: Giant Triton snails take on crown of thorns starfish to save Great Barrier Reef; Caltech develops collaborative DNA robots to perform tasks on nanometer scale; US government bans use of Kaspersky antivirus software, on fears it contains spyware; AI driven financial services apps grow in sophistication; Fallout continues from that massive Equifax data breach; CCleaner PC performance software found to have malware; Supporting high-tech farming start-ups.