Alexander Fleming discovered the antibiotic, penicillin. He found this important substance purely by accident when he observed penicillium mold in a petri dish preventing staphyloccoccus bacteria from growing around the mold.
When he isolated penicillin, Fleming found that the substance killed bacteria but had no effect on animals. Fleming had trouble isolating and producing the substance because it was unstable. Other scientists, such as Ernst Chain and Howard Florey, were able to isolate penicillin and mass produce it for widespread use. The first antibiotic discovered, penicillin kills the dangerous bacteria that causes diseases such as diphtheria, meningitis and strep throat.Learn More
Fleming’s right-hand rule is a commonly used mnemonic in both physics and electrical engineering that shows the direction of the current generated in a conductor that is forcefully made to cut perpendicularly through a magnetic field. The force vector is perpendicular to the current and magnetic field vectors.Full Answer >
To find your ancestral origins, gather as much information as you can find about your family and heritage, such as birth and death documents and old photos. Being prepared is the key element to making the search successful.Full Answer >
Alexander the Great was approximately 5 feet tall, which was the average height for Greek males of that time period. Due to his average height, Alexander and his comrades referred to certain taller people they met in their travels as giants.Full Answer >
Alexander the Great was a conqueror of the Persian Empire who built up the largest empire of the ancient world. He ruled Macedonia beginning in 336 B.C. after his father's rule ended.Full Answer >