virus. No negative side effects such as toxicity, carcinogenicity or mutagenicity have been observed, making this drug lead a very strong antiviral drug candidate for these viruses. The scientists are now working to synthesize variants of the molecule to improve its activity and enter planned pre-clinical and clinical trials. However, in an October 2018 update, the research team reported that none of their current designs had produced a highly potent dengue protease inhibitor that could be tested in vivo. In June 2013, the Clean Energy Project published a database of over 2.3 million organic molecules which have had their properties characterized. Of these, 35,000 molecules have shown the potential to double the efficiency over organic solar cells currently being produced. Before this initiative, scientists knew of just a handful of carbon-based materials that were able to convert sunlight into electricity efficiently. In February 2010, the FightAIDS@Home project scientists announced that they have found two compounds which make a potentially new class of AIDS-fighting drugs possible. The compounds attach to the virus at newly discovered binding sites, and thus can be used to "enhance existing therapies, treat drug-resistant strains of the disease, and slow the evolution of drug resistance in the virus." In July 2015, the Drug Search for Leishmaniasis project announced it had tested the top 10 compounds with highest predicted efficiency out of over 100 identified via WCG workunits. Of those 10, 4 showed "positive results" in in vitro testing, with one showing "an exceptionally promising result". In August 2017, in vivo testing of the 4 compounds on hamsters showed favourable results, with one compound inducing "an almost complete curing of the lesions in two out of five hamsters." However, in a March 2018 update, the research team announced none of the 10 tested compounds had sufficient anti-leishmaniasis activity. In July 2015, the Computing for Clean Water project announced that a paper had been published in the Nature Nanotechnology journal describing a new type of water filter efficiently utilising nanotubes. "[The] nanotubes are made of single-atom-thick sheets of carbon atoms, called graphene, rolled up into tiny tubes, with diameters of just a few nanometers - one ten-thousandth the diameter of a human hair. The size of the tubes allows water molecules to pass through, but blocks larger pathogens and contaminants, purifying the water." By running simulations on WCG, the scientists discovered that certain kinds of natural vibrations called phonons,