Flat tire

I bought a used Schwinn Bike last month for 50 bucks.

This month I decided to start to ride bike with my neighbor (Eddie). He already rode to work for approximately 3 months.

Two weeks ago, it was my first time to ride a long distance. Riding time is about 1.5 hrs 1 way. Starting from intersection of Valpey Park Ave and Grimmer Blvd to the intersection of Zanker Rd and E Trimble Rd.

The ride today (8/23) was as good as it could be.
First we start from the same intersection, then at S Grimmer Blvd and Paseo Padre Pkwy, turn right. Along Paseo Padre Pkwy to Mission blvd, Eddie planned to ride up to slope but I was a bit exhausted after the initial ride.

So we headed towards Warm Spring Blvd, and towards our destination.

While on the trail near 880 and close to 237, something happened.

Eddie rode quite fast and I tried to catch him. But the harder I tried the more distance is between us. Finally my rear tire started to have more friction to the ground.
Stop the ride, and find there were some kind of plant seeds with very sharp end. There are several seeds on both front and rear tires. Eddie was ahead of me but his tires got the same problems.
The location is very close the the Borders near Ranch Drive and McCarthy Blvd in Milpitas CA.
We just waited for Hsinni and Eva(Eddie's wife) to come and while waiting, have a cup of ice coffee.

It was quite an experience.
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Today we had a gathering at our home.