Are there aliens? A strong radio wave captured for 72 seconds from the direction of Sagittarius, the "Wow! signal" whose identity has remained unknown for 50 years... "Rationally thinking, there is a possibility it's a signal from aliens."

Select a sentence or use the bottom play control. The current sentence is highlighted during playback, and you can move backward, forward, or seek to repeat it.

Turn translations or readings on in learning settings, and select unfamiliar words to view their meanings. Try understanding first, then reveal only the help you need.

Start with the displayed difficulty, then listen to or read a short section. If you understand the main idea with only a few lookups per sentence, it is usually suitable.