A novel method for the measurement of ultra small refractive index differences between two wavelengths is demonstrated. The method is based on the change of the phase matching conditions of a ...

Niche differences between two sympatric whiptail lizards (Cnemidophorus abaetensis and C. ocellifer, Teiidae) in the restinga habitat of northeastern Brazil Diferenças de nichos entre duas espécies ...

Optical Illusion: We have two pictures given below, which are of the same room. However, despite looking pretty much the same, the rooms do have a few differences. You have to spot them in under 10 ...