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Space to play or pause, M to mute, left and right arrows to seek, up and down arrows for volume. Elliot Spencer, co-host of Rollercoaster, walks up to Ruben, looking despondent. In front of Ruben is a ...

Discover how red cabbage can act as a natural pH indicator, revealing whether substances are acids or bases through beautiful color changes. pH is a measure that tells us how acidic or basic a ...