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Cold Fusion by 2020. It can happen! By Piday2015 Price : $22.95
A new design for Pi Day 2016: March 14 2016. 3.14.16 (rounding up pi). By Piday2015 Price : $20.10
Pi Day 2015: A once-in-a-lifetime moment in infinity On March 14 2015 math & science mavens (and pie lovers) will celebrate ... By Piday2015 Price : $4.05
Pi Day 2015: A once-in-a-lifetime moment in infinity On March 14 2015 math & science mavens (and pie lovers) will celebrate ... By Piday2015 Price : $20.10
Pi Day 2015: A once-in-a-lifetime moment in infinity On March 14 2015 math & science mavens (and pie lovers) will celebrate ... By Piday2015 Price : $14.95
Pi Day 2015: A once-in-a-lifetime moment in infinity On March 14 2015 math & science mavens (and pie lovers) will celebrate ... By Piday2015 Price : $20.30
Pi Day 2015: A once-in-a-lifetime moment in infinity On March 14 2015 math & science mavens (and pie lovers) will celebrate ... By Piday2015 Price : $20.10
Pi Day 2015: A once-in-a-lifetime moment in infinity On March 14 2015 math & science mavens (and pie lovers) will celebrate ... By Piday2015 Price : $24.10
Celebrate the infinitely irrational number Pi with this Keep Calm but Question Everything mug. By Piday2015 Price : $14.95
Pi Day 2015: A once-in-a-lifetime moment in infinity On March 14 2015 math & science mavens (and pie lovers) will celebrate ... By Piday2015 Price : $17.20
Pi Day 2015: A once-in-a-lifetime moment in infinity On March 14 2015 math & science mavens (and pie lovers) will celebrate ... By Piday2015 Price : $22.95
Pi Day 2015: A once-in-a-lifetime moment in infinity On March 14 2015 math & science mavens (and pie lovers) will celebrate ... By Piday2015 Price : $25.40
Pi Day 2015: A once-in-a-lifetime moment in infinity On March 14 2015 math & science mavens (and pie lovers) will celebrate ... By Piday2015 Price : $6.85
Get a picture of your favorite baby celebrating Pi Day 2015: A once-in-a-lifetime moment in infinity. On March 14 2015 math ... By Piday2015 Price : $14.90
Celebrate Pi Day (on Einstein's birthday March 14) every year! By Piday2015 Price : $5.50