Last updated on Monday 20 January 2014 at 23:15 UK

Watch Blue's Clues Series 4 Episode 4 Online Free

Blue's Clues Series 4 Episode 4PLAY

Steve discovers his heartbeat with a stethoscope -- and Blue has discovered something, too. We play Blue’s Clues to figure out what Blue discovered. We visit an anatomy internet site and help Cursor label the taste buds, the eardrum and the pupil, based on their descriptions. Then we skidoo into a science lab to help Sarah Scientist identify the heart, the stomach and the lungs and figure out what roles they play in our bodies.

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