A barking test tube | Do you hear a puppy barking too?🐕 For step-by-step instructions of this experiment go here: https://mel.sc/sL1/ A similar experiment is included in the... | By MEL Science
![5600, 5585, 57??, 7525 Barking Sidings | London underground stations, London underground train, London underground tube 5600, 5585, 57??, 7525 Barking Sidings | London underground stations, London underground train, London underground tube](https://i.pinimg.com/736x/62/66/6b/62666b34095a4746a53bfba1a19dc2c2.jpg)
5600, 5585, 57??, 7525 Barking Sidings | London underground stations, London underground train, London underground tube
![colour transparency, Barking Underground station, District line by Adam Praverman, 10 August 2001 | London Transport Museum colour transparency, Barking Underground station, District line by Adam Praverman, 10 August 2001 | London Transport Museum](https://www.ltmuseum.co.uk/system/files/styles/collection_item_component_600_px_wide/private/collection_item/i00001dy.jpg?itok=IoqTsh5D)
colour transparency, Barking Underground station, District line by Adam Praverman, 10 August 2001 | London Transport Museum
![Dagenham Heathway London Underground tube surface station entrance on bridge carrying road over District Line London Borough of Barking & Dagenham UK Stock Photo - Alamy Dagenham Heathway London Underground tube surface station entrance on bridge carrying road over District Line London Borough of Barking & Dagenham UK Stock Photo - Alamy](https://c8.alamy.com/comp/G2P775/dagenham-heathway-london-underground-tube-surface-station-entrance-G2P775.jpg)