It is about 12ins (30 cm) long which is about two or three times bigger compared to similar objects of its type.

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"Images taken using terahertz rays have good contrast between similar density objects, " explained co-author Willie Padilla.

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Elliptic's ultrasound technology uses sound waves and microphones to detect movement, similar to how radar detects objects.

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This radiation can be detected although Dyson spheres remain difficult to distinguish from natural astronomical objects that give off similar signatures.

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"We were motivated by a desire to design a system for anyone to both build with fabric in a way similar to playing with Lego and create objects that are rich with relevant context-aware computation without having to program, " said Nanda, who devised the patches for a project towards a Media Arts and Sciences masters degree.

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But the State Department has similar five-year bilateral agreements with eight other countries, restricting importation of objects like pre-Columbian masks from Bolivia, Khmer statues from Cambodia and historic terra cotta sculptures from Mali.

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The researchers say this dust must be coming from collisions among small bodies similar to the comets or icy bodies that make up today's Kuiper Belt objects in our solar system.

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Objects buried with them include 30 gaming counters, which were possibly used for a game similar to backgammon, and placed with the bodies for entertainment during the journey to the afterlife.

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