diff --git a/paper/pnas/figs/fig1b.pdf b/paper/pnas/figs/fig1b.pdf
index b3c0278..ab6b04b 100644
Binary files a/paper/pnas/figs/fig1b.pdf and b/paper/pnas/figs/fig1b.pdf differ
diff --git a/paper/pnas/main.pdf b/paper/pnas/main.pdf
index 6df5fe8..b9901a9 100644
Binary files a/paper/pnas/main.pdf and b/paper/pnas/main.pdf differ
diff --git a/paper/pnas/make_figs.py b/paper/pnas/make_figs.py
index 5fb7cac..efd2f1a 100644
--- a/paper/pnas/make_figs.py
+++ b/paper/pnas/make_figs.py
@@ -179,7 +179,7 @@ def _robot(ax, x, y, fc="#e8eef5", dots=(), lost=(), w=0.52, h=0.52):
 def fig1b():
     from matplotlib.patches import Circle, FancyArrowPatch
 
-    W, H = 11.4, 4.1
+    W, H = 11.4, 4.5
     fig, ax = plt.subplots(figsize=(W, H))
     ax.set_xlim(0, W)
     ax.set_ylim(0, H)
@@ -188,11 +188,11 @@ def fig1b():
     ax.text(0.05, H - 0.05, "B", fontsize=13, fontweight="bold", va="top")
 
     def arrow(p, q, color="#666", lw=1.2, style="-|>", shrink=2.0, ls="-"):
-        ax.add_patch(FancyArrowPatch(p, q, arrowstyle=style, mutation_scale=9, color=color,
+        ax.add_patch(FancyArrowPatch(p, q, arrowstyle=style, mutation_scale=10, color=color,
                                      lw=lw, linestyle=ls, shrinkA=shrink, shrinkB=shrink))
 
     # ---------------- left: a society in space (contemporaries exchanging messages)
-    cx, cy, r = 2.45, 2.45, 0.95
+    cx, cy, r = 2.45, 2.70, 0.95
     dotsets = [(BLUE, GOLD), (GREEN,), (BLUE, GREEN), (GOLD, GREEN), (BLUE,)]
     pos = []
     for i, ds in enumerate(dotsets):
@@ -202,61 +202,61 @@ def fig1b():
         _robot(ax, x, y, dots=ds)
     for i, j2 in [(0, 2), (1, 3), (2, 4), (0, 3), (1, 4)]:
         arrow(pos[i], pos[j2], color="#99a", lw=0.9, style="<|-|>", shrink=26, ls=(0, (4, 2)))
-    ax.text(pos[0][0] + 0.60, pos[0][1] + 0.30, "\u2026", fontsize=9, ha="center",
-            bbox=dict(boxstyle="round,pad=0.22", fc="white", ec="#99a", lw=0.8))
-    clk = (0.55, 3.72)
+    ax.text(pos[0][0] + 0.72, pos[0][1] + 0.38, "hi!", fontsize=8, ha="center",
+            bbox=dict(boxstyle="round,pad=0.25", fc="white", ec="#99a", lw=0.8))
+    clk = (0.55, 4.08)
     ax.add_patch(Circle(clk, 0.21, fc="white", ec="#445", lw=1.1))
     ax.plot([clk[0], clk[0]], [clk[1], clk[1] + 0.13], color="#445", lw=1.0)
     ax.plot([clk[0], clk[0] + 0.10], [clk[1], clk[1]], color="#445", lw=1.0)
-    ax.text(clk[0], clk[1] - 0.34, "one moment", ha="center", fontsize=6, style="italic",
+    ax.text(clk[0], clk[1] - 0.34, "one moment", ha="center", fontsize=7, style="italic",
             color="#555")
-    ax.text(2.45, 0.48, "a society in space", ha="center", fontsize=9.5, fontweight="bold")
-    ax.text(2.45, 0.22, "contemporaries exchanging messages \u2014 multi-agent systems, agent economies",
-            ha="center", fontsize=6.6, style="italic", color="#555")
+    ax.text(2.45, 0.55, "a society in space", ha="center", fontsize=11, fontweight="bold")
+    ax.text(2.45, 0.24, "contemporaries exchanging messages \u2014 multi-agent systems, agent economies",
+            ha="center", fontsize=7.5, style="italic", color="#555")
 
     # ---------------- middle: the shift of perspective
-    arrow((4.62, 2.30), (5.90, 2.30), color="#445", lw=2.0, style="-|>")
-    ax.text(5.26, 2.44, "the same ecosystem,\nseen along its time axis", ha="center",
-            va="bottom", fontsize=7, style="italic", color="#334", linespacing=1.3)
+    arrow((4.60, 2.50), (5.95, 2.50), color="#445", lw=2.0, style="-|>")
+    ax.text(5.27, 2.66, "the same ecosystem,\nseen along its time axis", ha="center",
+            va="bottom", fontsize=8, style="italic", color="#334", linespacing=1.3)
 
     # ---------------- right: a society in time (a pedigree)
-    axx = 6.55
-    arrow((axx, 3.90), (axx, 0.90), color="#445", lw=1.3)
-    for gy, lab in [(3.45, "gen 0"), (2.20, "gen 1"), (1.05, "gen 2")]:
-        ax.text(axx - 0.12, gy, lab, ha="right", va="center", fontsize=6.5, color="#445")
+    axx = 6.8
+    arrow((axx, 4.30), (axx, 1.00), color="#445", lw=1.3)
+    for gy, lab in [(3.80, "gen 0"), (2.55, "gen 1"), (1.35, "gen 2")]:
+        ax.text(axx - 0.12, gy, lab, ha="right", va="center", fontsize=7.5, color="#445")
 
-    p1, p2 = (7.55, 3.45), (9.25, 3.45)
-    c1, c2 = (7.15, 2.20), (8.65, 2.20)
-    g2 = (8.65, 1.05)
+    p1, p2 = (8.0, 3.80), (9.5, 3.80)
+    c1, c2 = (7.5, 2.55), (9.0, 2.55)
+    g2 = (9.0, 1.35)
     _robot(ax, *p1, dots=(BLUE, GOLD))
     _robot(ax, *p2, dots=(GREEN, BLUE))
     _robot(ax, *c1, dots=(BLUE,), lost=(GOLD,))
     _robot(ax, *c2, dots=(BLUE, GREEN, GOLD))
     _robot(ax, *g2, dots=(BLUE, GREEN, GOLD))
-    arrow((7.42, 2.94), (7.20, 2.66), color="#666")
-    ax.text(7.02, 2.86, "inherit\n(train on output)", ha="right", fontsize=6, style="italic",
-            color="#555", linespacing=1.2)
-    arrow((7.72, 2.94), (8.48, 2.66), color="#666")
-    arrow((9.15, 2.94), (8.84, 2.66), color="#666")
-    ax.text(8.68, 2.92, "merge (sex)", ha="center", fontsize=6, style="italic", color="#555")
-    ax.text(7.15, 1.50, "rare skill lost", ha="center", fontsize=5.8, style="italic",
+    arrow((7.87, 3.26), (7.56, 3.04), color="#666")
+    ax.text(7.42, 3.16, "inherit", ha="right", fontsize=7, style="italic", color="#555")
+    arrow((8.15, 3.24), (8.85, 3.04), color="#666")
+    arrow((9.40, 3.24), (9.13, 3.04), color="#666")
+    ax.text(9.0, 3.14, "merge (sex)", ha="center", fontsize=7, style="italic", color="#555",
+            bbox=dict(boxstyle="round,pad=0.12", fc="white", ec="none"))
+    ax.text(7.5, 1.83, "rare skill lost", ha="center", fontsize=6.8, style="italic",
             color="#a33")
-    arrow((8.65, 1.64), (8.65, 1.46), color="#666")
-    globe = (10.55, 1.60)
-    ax.add_patch(Circle(globe, 0.30, fc="#eaf4fb", ec="#2c7fb8", lw=1.2))
+    arrow((9.0, 1.99), (9.0, 1.81), color="#666")
+    globe = (10.55, 1.85)
+    ax.add_patch(Circle(globe, 0.32, fc="#eaf4fb", ec="#2c7fb8", lw=1.2))
     from matplotlib.patches import Arc as _Arc
-    ax.add_patch(_Arc(globe, 0.30, 0.60, theta1=90, theta2=270, ec="#2c7fb8", lw=0.8))
-    ax.add_patch(_Arc(globe, 0.30, 0.60, theta1=270, theta2=90, ec="#2c7fb8", lw=0.8))
-    ax.plot([globe[0] - 0.30, globe[0] + 0.30], [globe[1], globe[1]], color="#2c7fb8", lw=0.8)
-    ax.text(globe[0], globe[1] - 0.42, "reality\n(verifier)", ha="center", va="top", fontsize=6,
+    ax.add_patch(_Arc(globe, 0.32, 0.64, theta1=90, theta2=270, ec="#2c7fb8", lw=0.8))
+    ax.add_patch(_Arc(globe, 0.32, 0.64, theta1=270, theta2=90, ec="#2c7fb8", lw=0.8))
+    ax.plot([globe[0] - 0.32, globe[0] + 0.32], [globe[1], globe[1]], color="#2c7fb8", lw=0.8)
+    ax.text(globe[0], globe[1] - 0.44, "reality\n(verifier)", ha="center", va="top", fontsize=7,
             color="#2c7fb8", linespacing=1.2)
-    arrow((10.26, 1.45), (9.02, 1.15), color="#2c7fb8", lw=1.2)
-    ax.text(9.72, 1.52, "ground\n(immigrate)", ha="center", fontsize=6, style="italic",
-            color="#2c7fb8", linespacing=1.2)
-    ax.text(8.55, 0.48, "a society in time", ha="center", fontsize=9.5, fontweight="bold")
-    ax.text(8.55, 0.22, "generations coupled by inheritance, recombination, and grounding \u2014 "
-                        "where population genetics applies",
-            ha="center", fontsize=6.6, style="italic", color="#555")
+    arrow((10.22, 1.70), (9.38, 1.45), color="#2c7fb8", lw=1.2)
+    ax.text(9.82, 1.78, "ground\n(immigrate)", ha="center", va="bottom", fontsize=7,
+            style="italic", color="#2c7fb8", linespacing=1.2)
+    ax.text(8.9, 0.55, "a society in time", ha="center", fontsize=11, fontweight="bold")
+    ax.text(8.9, 0.24, "generations coupled by inheritance, recombination, grounding \u2014 "
+                       "where population genetics applies",
+            ha="center", fontsize=7.2, style="italic", color="#555")
     save(fig, "fig1b")
 
 # ---------------------------------------------------------------- fig 2: grounding + MNIST