What happens to vitelline membrane after fertilization? In sea urchins, the formation of the vitelline membrane comes directly after fertilization and later thickens to form…
What was the London 2012 Cultural Olympiad? The London 2012 Games included a four-year Cultural Olympiad. It reached a climax with the Olympic Games Opening…
What are PCB antennas used for? PCB antenna is a transducer converting current waves into electromagnetic (EM) waves in a high-frequency PCB. PCB antennas convert…
What causes AR-15 double feed? In this week’s NRA Firearm Training Tip we cover the last common malfunction you may encounter while shooting your AR-15,…
