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In his instantly recognizable, grandly sweeping style, eL Seed has painted Arabic calligraffiti murals everywhere from Tunisia to Paris, Dubai to New York. Recently, he created his most ambitious project yet: a mural that spans 50 buildings — and can only be fully seen from a nearby mountain. eL Seed pursued this self-funded project as a way to make a political point, but he describes, the real transformation was personal.

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Archaeology is a puzzle. For Sarah Parcak, the arduous process of trying to find ancient treasures is made exponentially easier by satellite imagery.

Illustration by Maya Sariahmed/TED.

Paleo-oncologist Katie Hunt has a personal connection to an exciting new field of archaeology.

Ready to go beyond this week’s headlines? 5 primary sources worth reading next—about Egypt, Al Jazeera, and international reporting.

We asked an international group of 12 artists, designers, photographers and activists to provide one image that encapsulates what inequality means to them — and to explain their selection. The results are stunning and thought-provoking. Warning: some of them might make you cry.

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Strange as it may seem, archaeologists often look to the sky to discover sites buried deep beneath the earth. Space archaeology, as it’s called, refers to the use of high-resolution satellite imaging and lasers to map and model archaeological ruins. TED Fellow Sarah Parcak makes extensive use of this technology in her work. She explains why it’s so useful.

Iwan Baan takes photos of homes born from human ingenuity. See 18 of his intriguing images.