The twenty-three amino acids are the molecular building blocks of protein. The amino acids can be divided into two groups: essential amino acids and non-essential amino acids. The nine essential amino acids are so designated because they must be supplied by the foods we eat.
Rush Limbaugh is the longest reigning ratings leader in all talk radio. Rush is the perennial Premiere Radio Networks' top nationally syndicated radio talk show reaching nearly 20 million listeners weekly on 600 plus stations. Rush has ruled the talk radio ratings for more than two decades.
According to podcast advertising company Podtrac, the first nine episodes had about 2.2 million listeners each. (The tenth episode aired Thursday morning.) The top ten podcasts after Serial bring in an average of 620,000 listeners per episode. And audience size dwindles significantly after that. Outside the top 200 shows, downloads and streams average about 5,000 per episode. Still, there's a lot of niche programming, which means something for everyone. More than 40 million Americans regularly listen to podcasts, or roughly 15% of the population. That's up from 9% in 2008, according to Edison Research.