Initially, Zhang Heng and Bai Qing thought that the radio emission would yield a trove of information. Little did they expect that the only thing they would get was a word. It looked like Lin Sisi had deleted all the other pointless parts, leaving only the part that represented the final answer.
[Blue-green algae.]
"This is... cyanobacteria?" Bai Qing rummaged through the vocabulary in her head and found the right word for it.
"I know why the three children went to the river that night." Zhang Heng sighed, "They were collecting blue-green algae from the river."
