Many of us love dogs and cats. Unfortunately, not everyone has time or resources to adopt a few. Robotic pets can be the answer here. Take the Hana-chan robotic dog: it is a puppy with a sensor to detect smells and react to them. For instance, she wags her tail when the odor is not too bad or dancing with joy it something smells good.
More gadgets like this: here
The bad news? Something like this doesn’t come particularly cheap.
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