Philadelphia Children's Museum on Yahoo! News Photos

In this photograph taken by AP Images for Doubletree; Lillian ...

(AP) — Fri, 22 Jan 2010 20:38:51 GMT

(AP) - In this photograph taken by AP Images for Doubletree; Lillian climbs through the tree tunnels at Doubletree Hotels and Arbor Day Foundation's 'Exploring Trees Inside and Out' exhibit at the Please Touch Museum in Philadelphia Friday, Jan. 22, 2010. (AP Images/Mark Stehle for Doubletree)

In this photograph taken by AP Images for Doubletree; Marvin ...

(AP) — Fri, 22 Jan 2010 20:38:39 GMT

(AP) - In this photograph taken by AP Images for Doubletree; Marvin Dozier, left, a staff member at the Please Touch Museum, demonstrates flying among the trees for Gracie A., center, and Rhys W. at Doubletree Hotels and Arbor Day Foundation's 'Exploring Trees Inside and Out' exhibit at the Please Touch Museum in Philadelphia Friday, Jan. 22, 2010. (AP Images/Mark Stehle for Doubletree)

In this photograph taken by AP Images for Doubletree; Miles ...

(AP) — Fri, 22 Jan 2010 20:38:27 GMT

(AP) - In this photograph taken by AP Images for Doubletree; Miles Ritter and his mother Caroline Ritter listen to the sounds of nature at Doubletree Hotels and Arbor Day Foundation's 'Exploring Trees Inside and Out' exhibit at the Please Touch Museum in Philadelphia Friday, Jan. 22, 2010. (AP Images/Mark Stehle for Doubletree)

In this photograph taken by AP Images for Doubletree; Rhys W., ...

(AP) — Fri, 22 Jan 2010 20:38:15 GMT

(AP) - In this photograph taken by AP Images for Doubletree; Rhys W., left, and Colin A. play among the leaves at Doubletree Hotels and Arbor Day Foundation's 'Exploring Trees Inside and Out' exhibit at the Please Touch Museum in Philadelphia Friday, Jan. 22, 2010. (AP Images/Mark Stehle for Doubletree)

This undated photo released by the Please Touch Museum shows ...

(AP) — Wed, 17 Sep 2008 20:14:05 GMT

(AP) - This undated photo released by the Please Touch Museum shows the In the Flight Fantasy galleries at the Please Touch Museum in Philadelphia, where kids can power a variety of 'flying machines' using their own body's energy, play hopscotch on clouds, and learn about aerodynamics. (AP Photo/ Michael Branscom, Please Touch Museum)

In this May 7, 2008 file photo, Ben Gaffney paints gold trim ...

(AP) — Wed, 17 Sep 2008 20:13:32 GMT

(AP) - In this May 7, 2008 file photo, Ben Gaffney paints gold trim at Memorial Hall in Philadelphia. The hall, one of the jewels of the Centennial Exposition of 1876 has become the new home of the Please Touch Museum. (AP Photo/Matt Rourke, File)

In this May 7, 2008 file photo, people watch workmen mount the ...

(AP) — Wed, 17 Sep 2008 20:13:20 GMT

(AP) - In this May 7, 2008 file photo, people watch workmen mount the flame for a replica of the Statue of Liberty made of found objects by artist Leo Sewell at Memorial Hall in Philadelphia. The hall, one of the jewels of the Centennial Exposition of 1876 has become the new home of the Please Touch Museum. (AP Photo/Matt Rourke, File)

In this May 7, 2008 file photo, a flame from a replica of the ...

(AP) — Wed, 17 Sep 2008 20:12:52 GMT

(AP) - In this May 7, 2008 file photo, a flame from a replica of the Statue of Liberty made of found objects by artist Leo Sewell is seen before workmen mount it at Memorial Hall in Philadelphia. The hall, one of the jewels of the Centennial Exposition of 1876 has become the new home of the Please Touch Museum. (AP Photo/Matt Rourke, File)

In this undated photo released by the Please Touch Museum, a ...

(AP) — Mon, 08 Sep 2008 16:35:02 GMT

(AP) - In this undated photo released by the Please Touch Museum, a life-sized replica of the Statue of Liberty's Arm & Torch, a sculpture built of toys and found objects by Philadelphia artist Leo Sewell, greets visitors in the Museum's Great Hall. (AP Photo/Michael Branscom, Please Touch Museum)

In this May 7, 2008 file photo, Memorial Hall is shown under ...

(AP) — Mon, 08 Sep 2008 16:15:47 GMT

(AP) - In this May 7, 2008 file photo, Memorial Hall is shown under renovations in Philadelphia. The hall, one of the jewels of the Centennial Exposition of 1876 has become the new home of the Please Touch Museum. (AP Photo/Matt Rourke)