Rena Marie Pacella

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Inside a CAVE

Inside a CAVE

Pedal-Powered Panzer

Pedal-Powered Panzer

Steaming Down the Road

Steaming Down the Road

Half Boat, Half Car, All Adventure

Half Boat, Half Car, All Adventure

The Natural Artificial Foot

The Natural Artificial Foot

A Homebuilt Tumor-Killer

A Homebuilt Tumor-Killer

Extreme Engineering: A Tunnel Through The Alps

Extreme Engineering: A Tunnel Through The Alps

Extreme Engineering: The Deepest Oil Well

Extreme Engineering: The Deepest Oil Well