The (any animals, people, thoughts, ideas) are (any adjective)... (alive, tired, dead, funny, true, weird)... you are not trying to memorize exact sentences, are you? Think of the basic construct, instead of the exact words used...This is only my personal philosophy..
This is exactly why Duo needs a feature to repeat your answer back to you. It's hard to tell how we're really pronouncing something unless we hear ourselves as someone else does. You may be speaking clearly, but not correctly, even though it sounds right to your ears.
OTOH, I grew up with a German-speaking grandmother and in college was told I spoke with a north German accent--no surprise, since that's where her parents were from--yet sometimes Duo doesn't understand me.
Either case, it would be great to have our own words played back to us.
Duolingo, this is NOT an inspired sentence. On the plus side, I greatly appreciate your having greatly reduced the excessive use of the word "interesting" in sentences, and also enjoy your beginning to sprinkle allusions to famous politicians, creative people, and other celebrities into your texts. When I see "Robert Musil" (the author of a very famous, 2,000-page book called "The Man without Qualities"--which has sometimes been ranked with the work of James Joyce and Marcel Proust--I know that we're on the right track. Germany is more than holocausts, beer, and sausages. Gut gemacht!