# CONDOMS WITH SILVER NANOPARTICLES: THE NEW CHALLENGE AGAINST HIV AND HERPES VIRUS SEXUAL TRANSMISSION

The medical microbiologist Xiaojian Yao and his team of the University of Manitoba have discovered a potential new way in the challenge against HIV and the Herpes virus: silver nanoparticles.

Silver Nanoparticles

When the Canadian researchers tried to coat condoms in microscopic particles of silver (long since known as disinfectant agent) they found that, putting the silver-coated condoms into contact with HIV and Herpes (both sexual transmissible viruses), they were completely inactivated.

condoms

Then, according to these results, these silver nanoparticles could be bonding to the viruses or altering “key proteins” on the surface of the virus, avoiding them from attaching to their host.

In the bargain, there is a not entirely negligible advantage: the silver nanoparticles do not cause inflammation, as it currently happens using condoms that have the anti-microbial substance called Nonoxynol-9.

For anyone who wants to delve into this new technology, here is a technical but simply video about the lab synthesis of silver nanoparticles.

# THE RUBIK’S CUBE MATH AND TUTORIAL – MAXIMUM NUMBER OF MOVES TO SOLVE CUBES WITH N SQUARES

The Rubik’s Cube is a 3D mechanical puzzle invented by the Hungarian architect Ernő Rubik in 1974.

Rubik’s Cube

Its original and simpler version (3×3) – that presents 9 squares on each of the 6 faces, with 54 squares totally – can assume up to 43.252.003.274.489.856.000 positions!

Nonetheless, every position of 3×3 Rubik’s Cube can be solved in 20 moves or less (named “God’s Number”), whereas the maximum number of moves required to solve a Rubik’s cube with N squares per row is proportional to N2/log N.

These two results were found respectively by the cuber Tomas Rokicki and his colleagues in 2010 and by the Erik Demaine‘s (Professor of Computer science and engineering at MIT) research team in 2011.

Finally, I suggest you to watch this tutorial video which explains how to solve a Rubik’s Cube in under a minute.